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People wave U.S. flags while cheering as police drive down Arlington street in Watertown, Massachusetts April 19, 2013. The second suspect in the Boston Marathon bombing, Dzhokhar Tsarnaev, 19, was bleeding, seriously injured and being treated at a Massachusetts hospital on Friday after he was found hiding in a boat, state police said. REUTERS/Shannon Stapleton ( USA-EXPLOSIONS/BOSTON )

In this Friday, April 19, 2013 photo obtained by The Associated Press and authenticated by a member of the Bureau of Alcohol, Tobacco, Firearms and Explosives, ATF and FBI agents check suspect Dzhokhar Tsarnaev for explosives and also give him medical attention after he was apprehended in Watertown, Mass., at the end of a tense day that began with his older brother, Tamerlan, dying in a getaway attempt. Tsarnaev lay hospitalized in serious condition under heavy guard Saturday as investigators continue piecing together the who and why of the two brothers involved in the deadly Boston Marathon bombings. (AP Photo) ( Boston Marathon Explosions )

This image obtained April 19, 2013 courtesy CBS News shows Dzhokhar Tsarnaev, a suspect in the Boston Marathon bombing who was captured Friday night, April 19, 2013 after he was found hiding in a boat in a Boston suburb. US police captured an ethnic Chechen teenager suspected of staging the Boston marathon bombings, after a massive manhunt that virtually shut down the city and its suburbs. After a tip from a local resident, police found Dzhokhar Tsarnaev, 19, hiding in a boat in a suburban backyard in Watertown, wounded and weary after a gun battle with police overnight in which his accomplice brother was killed. CBS NEWS/AFP/Getty Images ( 519067732 )

This Friday, April 19, 2013 image made available by the Massachusetts State Police shows a police vehicle probing the boat where 19-year-old Boston Marathon bombing suspect, Dzhokhar Tsarnaev, was hiding in Watertown, Mass. He was pulled, wounded and bloody, from the boat parked in the backyard of a home in the Greater Boston area. (AP Photo/Massachusetts State Police) ( APTOPIX Boston Marathon Explosions )

FILE - This Friday, April 19, 2013 image made available by the Massachusetts State Police shows 19-year-old Boston Marathon bombing suspect, Dzhokhar Tsarnaev, hiding inside a boat during a search for him in Watertown, Mass. He was pulled, wounded and bloody, from the boat parked in the backyard of a home in the Greater Boston area. (AP Photo/Massachusetts State Police) ( Boston Marathon Explosions )

Investigators work near the location, on Saturday, April 20, 2013, in Watertown, Mass., where the previous night a suspect in the Boston Marathon bombings was arrested. Police captured Dzhokhar Tsarnaev, 19, the surviving Boston Marathon bombing suspect, in a backyard boat after a wild car chase and gun battle earlier in the day left his older brother dead. (AP Photo/Katie Zezima) ( APTOPIX Boston Marathon Explosions )

Police watch as an ambulance leaves Franklin Street at the end of the search for Dzhokhar Tsarnaev, the surviving suspect in the Boston Marathon bombings, in Watertown, Massachusetts April 19, 2013. Boston Police said on Friday they have taken custody of the second suspect, Dzhokhar Tsarnaev, and are sweeping the suburban Boston neighborhood where he was captured after a massive manhunt. REUTERS/Shannon Stapleton ( USA-EXPLOSIONS/BOSTON-CUSTODY )

This still frame from video shows Boston Marathon bombing suspect Dzhokhar Tsarnaev visible through an ambulance after he was captured in Watertown, Mass., Friday, April 19, 2013. A 19-year-old college student wanted in the Boston Marathon bombings was taken into custody Friday evening after a manhunt that left the city virtually paralyzed and his older brother and accomplice dead. (AP Photo/Robert Ray) ( APTOPIX Boston Marathon Explosions )

WATERTOWN MA - APRIL 19: Members of a police S.W.A.T. team exit Franklin Street moments after 19-year-old bombing suspect Dzhokhar A. Tsarnaev was apprehended on April 19, 2013 in Watertown, Massachusetts. A manhunt for a Tsarnaev ended this evening with his capture on a boat parked on a residential property in Watertown, Massachusetts. His brother Tamerlan Tsarnaev, 26, the other suspect, was shot and killed by police early this morning after a car chase and shootout with police. The two men are suspects in the bombings at the Boston Marathon on April 15 that killed three people and wounded at least 170.(Photo by Spencer Platt/Getty Images) ( 167088994 )

Members of the public cheer as police officers leave the scene where Dzhokhar Tsarnaev, the surviving suspect in the Boston Marathon bombings, was taken into custody in Watertown, Massachusetts April 19, 2013. Boston Police said on Friday they have taken custody of the second suspect, Dzhokhar Tsarnaev, and are sweeping the suburban Boston neighborhood where he was captured after a massive manhunt. REUTERS/Brian Snyder ( USA-EXPLOSIONS/BOSTON-CUSTODY )

A police officer stands guard at the scene as the search for suspect in the Boston Marathon bombings continues , Friday, April 19, 2013, in Watertown, Mass. Gunfire erupted Friday night amid the manhunt for the surviving suspect in the Boston Marathon bombing, and police in armored vehicles and tactical gear rushed into the Watertown neighborhood in a possible break in the case. (AP Photo/Matt Rourke) ( Police Converge Mass )

This surveillance photo released via Twitter Friday, April 19, 2013 by the Boston Police Department shows a suspect entering a convenience store that police are pursuing in Watertown, Mass. Police say he is one of two suspects in the fatal shooting of an MIT police officer and tied to the Boston Marathon bombing. (AP Photo/Boston Police Department) ( Police Converge Mass )

This photo released by the FBI early Friday April 19, 2013, shows what the FBI is calling suspect 1, in black cap, walking through the crowd in Boston on Monday, April 15, 2013, before the explosions at the Boston Marathon. (AP Photo/FBI) ( Police Converge Mass Boston )

This photo released by the FBI early Friday April 19, 2013, shows what the FBI is calling suspect 2, in white cap, walking through the crowd in Boston on Monday, April 15, 2013, before the explosions at the Boston Marathon. (AP Photo/FBI) ( Police Converge Mass Boston )

This Monday, April 15, 2013 photo provided by Bob Leonard shows second from left, Tamerlan Tsarnaev, who was dubbed Suspect No. 1 and third from left, Dzhokhar A. Tsarnaev, who was dubbed Suspect No. 2 in the Boston Marathon bombings by law enforcement. This image was taken approximately 10-20 minutes before the blast. (AP Photo/Bob Leonard) ( APTOPIX Boston Marathon Photographer )

An onlooker waits while police take into custody Dzhokhar Tsarnaev, the surviving suspect in the Boston Marathon bombings, in Watertown, Massachusetts April 19, 2013. Boston Police said on Friday they have taken custody of the second suspect, Dzhokhar Tsarnaev, and are sweeping the suburban Boston neighborhood where he was captured after a massive manhunt. REUTERS/Brian Snyder ( USA-EXPLOSIONS/BOSTON-CUSTODY )

A gathering of people including the media gather around a police officer as he leaves the scene after the arrest of a suspect of the Boston Marathon bombings in Watertown, Mass., Friday, April 19, 2013. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during their getaway attempt. (AP Photo/Matt Rourke) ( Police Converge Mass )

Members of the public cheer as police officers leave the scene where Dzhokhar Tsarnaev, the surviving suspect in the Boston Marathon bombings, was taken into custody in Watertown, Massachusetts April 19, 2013. Boston Police said on Friday they have taken custody of the second suspect, Dzhokhar Tsarnaev, and are sweeping the suburban Boston neighborhood where he was captured after a massive manhunt. REUTERS/Brian Snyder ( USA-EXPLOSIONS/BOSTON-CUSTODY )

Police officers and SWAT team members greet each other after a police assault on a house on Franklin Street in Watertown, Massachusetts April 19, 2013. The manhunt for Dzhokhar Tsarnaev, 19, one of two brothers believed to have carried out the Boston Marathon bombing on Monday ended with his capture while hiding in the stern of a boat parked in the backyard of a house. REUTERS/John Taggart ( USA-EXPLOSIONS/SUSPECT )

WATERTOWN, MA - APRIL 19: Women cheer police as they exit Franklin Street after 19-year-old bombing suspect Dzhokhar A. Tsarnaev was apprehended on April 19, 2013 in Watertown, Massachusetts. A manhunt for Boston Marathon bombing suspect Tsarnaev ended this evening with his capture on a boat parked on a residential property in Watertown, Massachusetts. His brother Tamerlan Tsarnaev, 26, the other suspect, was shot and killed by police early this morning after a car chase and shootout with police. The two men are suspects in the bombings at the Boston Marathon on April 15 that killed three people and wounded at least 170.(Photo by Spencer Platt/Getty Images) ( 167090112 )

Massachusetts Governor Deval Patrick, at podium, speaks during a news conference, after the arrest of a suspect of the Boston Marathon bombings in Watertown, Mass., Friday, April 19, 2013. A 19-year-old college student wanted in the Boston Marathon bombings was taken into custody Friday evening after a manhunt that left the city virtually paralyzed and his older brother and accomplice dead. (AP Photo/Matt Rourke) ( Police Converge Mass )

U.S. President Barack Obama speaks to reporters from the White House in Washington, following the capture of the second Boston Marathon bombing suspect, April 19, 2013. REUTERS/Kevin Lamarque ( USA-EXPLOSIONS/BOSTON-OBAMA )

WATERTOWN, MA - APRIL 19: Law enforcement approach an area where a suspect is hiding on Franklin St., on April 19, 2013 in Watertown, Massachusetts. After a car chase and shoot out with police, one suspect in the Boston Marathon bombing, Tamerlan Tsarnaev, 26, was shot and killed by police early morning April 19, and a manhunt is underway for his brother and second suspect, 19-year-old Dzhokhar A. Tsarnaev. The two men are suspects in the bombings at the Boston Marathon on April 15, that killed three people and wounded at least 170. (Photo by Darren McCollester/Getty Images) ( 167089516 )

WATERTOWN, MA - APRIL 19: Law enforcement evacuate people near to where a suspect is hiding on Franklin St., April 19, 2013 in Watertown, Massachusetts. After a car chase and shoot out with police, one suspect in the Boston Marathon bombing, Tamerlan Tsarnaev, 26, was shot and killed by police early morning April 19, and a manhunt is underway for his brother and second suspect, 19-year-old Dzhokhar A. Tsarnaev. The two men are suspects in the bombings at the Boston Marathon on April 15, that killed three people and wounded at least 170. (Photo by Darren McCollester/Getty Images) ( 167087834 )

Police run down Franklin Street in Watertown, Massachusetts April 19, 2013. The surviving suspect in the Boston Marathon bombings was surrounded by police on Friday in Watertown, local media reported. The manhunt for Dzhokhar Tsarnaev, 19, one of two brothers believed to have carried out Monday's attack, took a dramatic turn just minutes after authorities announced they were lifting a shelter-in-place order imposed on the entire city of Boston. REUTERS/Shannon Stapleton ( USA-EXPLOSIONS/BOSTON-SURROUNDED )

WATERTOWN, MA - APRIL 19: Law enforcement approach an area reportedly where a suspect is hiding on April 19, 2013 in Watertown, Massachusetts. After a car chase and shoot out with police, one suspect in the Boston Marathon bombing, Tamerlan Tsarnaev, 26, was shot and killed by police early morning April 19, and a manhunt is underway for his brother and second suspect, 19-year-old Dzhokhar A. Tsarnaev. The two men are suspects in the bombings at the Boston Marathon on April 15, that killed three people and wounded at least 170. (Photo by Darren McCollester/Getty Images) ( 74268274 )

WATERTOWN, MA - APRIL 19: Members of a police S.W.A.T. team run to the scene where it was believed 19-year-old bombing suspect Dzhokhar A. Tsarnaev is in hiding on April 19, 2013 in Watertown, Massachusetts. After a car chase and shoot out with police, one suspect in the Boston Marathon bombing, Tamerlan Tsarnaev, 26, was shot and killed by police early morning April 19, and a manhunt is underway for his brother and second suspect, 19-year-old suspect Dzhokhar A. Tsarnaev. The two men, reportedly of Chechen origin, are suspects in the bombings at the Boston Marathon on April 15, that killed three people and wounded at least 170. (Photo by Spencer Platt/Getty Images) ( 74268270 )

WATERTOWN, MA - APRIL 19: Resident Rosie Meyer, who said she heard gunshots, reacts while watching police respond on April 19, 2013 in Watertown, Massachusetts. After a car chase and shoot out with police, one suspect in the Boston Marathon bombing, Tamerlan Tsarnaev, 26, was shot and killed by police early morning April 19, and a manhunt is underway for his brother and second suspect, 19-year-old suspect Dzhokhar A. Tsarnaev. The two men, reportedly Chechen of origin, are suspects in the bombings at the Boston Marathon on April 15, that killed three people and wounded at least 170. (Photo by Mario Tama/Getty Images) ( 167087573 )

WATERTOWN, MA - APRIL 19: Law enforcement approach an area reportedly where a suspect is hiding on April 19, 2013 in Watertown, Massachusetts. After a car chase and shoot out with police, one suspect in the Boston Marathon bombing, Tamerlan Tsarnaev, 26, was shot and killed by police early morning April 19, and a manhunt is underway for his brother and second suspect, 19-year-old Dzhokhar A. Tsarnaev. The two men are suspects in the bombings at the Boston Marathon on April 15, that killed three people and wounded at least 170. (Photo by Darren McCollester/Getty Images) ( 167087547 )

WATERTOWN, MA - APRIL 19: Law enforcement evacuate people away from an area reportedly where a suspect is hiding on April 19, 2013 in Watertown, Massachusetts. After a car chase and shoot out with police, one suspect in the Boston Marathon bombing, Tamerlan Tsarnaev, 26, was shot and killed by police early morning April 19, and a manhunt is underway for his brother and second suspect, 19-year-old Dzhokhar A. Tsarnaev. The two men are suspects in the bombings at the Boston Marathon on April 15, that killed three people and wounded at least 170. (Photo by Darren McCollester/Getty Images) ( 74268278 )

Police officers escort a family away from their house as police SWAT teams assault a house, firing their weapons on Franklin Street during the search for Dzhokhar Tsarnaev, the surviving suspect in the Boston Marathon bombings, in Watertown, Massachusetts April 19, 2013. The manhunt for Dzhokhar Tsarnaev, 19, one of two brothers believed to have carried out Monday's attack, took a dramatic turn just minutes after authorities announced they were lifting a shelter-in-place order imposed on the entire city of Boston. REUTERS/Jim Bourg (UNITED STATES - Tags: CRIME LAW) ( USA-EXPLOSIONS/GUNFIRE-SURROUNDED )

A family reacts after police SWAT teams assaulted a house on their street, firing their weapons on Franklin Street during the search for Dzhokhar Tsarnaev, the surviving suspect in the Boston Marathon bombings, in Watertown, Massachusetts April 19, 2013. The manhunt for Dzhokhar Tsarnaev, 19, one of two brothers believed to have carried out Monday's attack, took a dramatic turn just minutes after authorities announced they were lifting a shelter-in-place order imposed on the entire city of Boston. REUTERS/Jim Bourg (UNITED STATES - Tags: CRIME LAW) ( USA-EXPLOSIONS/GUNFIRE-SURROUNDED )

WATERTOWN, MA - APRIL 19: Law enforcement approach an area reportedly where a suspect is hiding on April 19, 2013 in Watertown, Massachusetts. After a car chase and shoot out with police, one suspect in the Boston Marathon bombing, Tamerlan Tsarnaev, 26, was shot and killed by police early morning April 19, and a manhunt is underway for his brother and second suspect, 19-year-old Dzhokhar A. Tsarnaev. The two men are suspects in the bombings at the Boston Marathon on April 15, that killed three people and wounded at least 170. (Photo by Darren McCollester/Getty Images) ( 167087557 )

Police keep a close watch on a blocked-off street as they move towards a police assault on a house on Franklin Street in Watertown, Massachusetts April 19, 2013. The manhunt for Dzhokhar Tsarnaev, 19, one of two brothers believed to have carried out the Boston Marathon bombing on Monday. REUTERS/John Taggart ( USA-EXPLOSIONS/SUSPECT )

People watch as police search for suspect in the Boston Marathon bombings, Friday, April 19, 2013, in Watertown, Mass. Gunfire erupted Friday night amid the manhunt for the surviving suspect in the Boston Marathon bombing, and police in armored vehicles and tactical gear rushed into the Watertown neighborhood in a possible break in the case. (AP Photo/Matt Rourke) ( Police Converge Mass )

This undated photo provided by the Middlesex District Attorney's Office shows Massachusetts Institute of Technology Police Officer Sean Collier, 26, of Somerville, Mass., who was shot to death Thursday, April 18, 2013 on the school campus in Cambridge, Mass. Authorities said surveillance tape recorded late Thursday showed one of the Boston Marathon bombing suspects during a robbery of a nearby convenience store before Collier was shot to death while responding to a report of a disturbance. (AP Photo/Middlesex District Attorney's Office) ( Police Converge Mass )

WATERTOWN, MA - APRIL 19: Police with guns drawn search for a suspect on April 19, 2013 in Watertown, Massachusetts. Earlier, a Massachusetts Institute of Technology campus police officer was shot and killed late Thursday night at the school's campus in Cambridge. A short time later, police reported exchanging gunfire with alleged carjackers in Watertown, a city near Cambridge. It's not clear whether the shootings are related or whether either are related to the Boston Marathon bombing. (Photo by Mario Tama/Getty Images) ( 74255003 )

Officials secure an area in Watertown, Mass., Friday, April 19, 2013. Reports of explosives being detonated and police are telling reporters to turn off their cell phones. Dozens of officers and National Guard members are in Watertown, where television outlets report that gunfire and explosions have been heard. (AP Photo/Julio Cortez) ( Police Coverage Mass )

WATERWOWN, MA - APRIL 19: A police officer runs with gun drawn while police search for a suspect on April 19, 2013 in Watertown, Massachusetts. (Photo by Mario Tama/Getty Images) ( 74255096 )

WATERTOWN, MA - APRIL 19: Boston Police gather in the parking lot in front of a Best Buy store on April 19, 2013 near the Watertown Mall in Watertown, Massachusetts. (Photo by Jared Wickerham/Getty Images) ( 74257135 )

WATERTOWN, MA - APRIL 19: Police with guns drawn search for a suspect on April 19, 2013 in Watertown, Massachusetts. (Photo by Mario Tama/Getty Images) ( 74254882 )

WATERTOWN, MA - APRIL 19: Boston Police Commissioner Edward Davis speaks during a media briefing in the parking lot of the Watertown Mall on April 19, 2013 in Watertown, Massachusetts. (Photo by Jared Wickerham/Getty Images) ( 74257296 )

Police officers aim their weapons Friday, April 19, 2013, in Watertown, Mass. A tense night of police activity that left a university officer dead on campus just days after the Boston Marathon bombings and amid a hunt for two suspects caused officers to converge on a neighborhood outside Boston, where residents heard gunfire and explosions.(AP Photo/Matt Rourke) ( Police Converge Mass )

Police work a crime scene Friday, April 19, 2013, in Watertown, Mass. (AP Photo/Matt Rourke) ( Police Converge Mass )

Police officers search an area of the Massachusetts Institute of Technology early Friday morning, April 19, 2013, in Cambridge, Mass. State police say a campus police officer has died from injuries in a shooting on the campus outside Boston. His name was not immediately released. (AP Photo/Craig Ruttle) ( MIT Shooting )

A bomb squad truck arrives at an incident Friday, April 19, 2013, in Watertown, Mass. in which shots were reported to have been fired. (AP Photo/Craig Ruttle) ( Police Converge Mass )

Colonel Timothy Albens (C), of the Massachusetts State Police, Boston Police Commissioner Ed Davis (L) and Watertown Chief of Police Edward P. Deveau (R) speak to the media as a search for the second of the two suspects wanted in the Boston Marathon bombings takes place on April 19, 2013 in Watertown, Massachusetts. (STAN HONDA/AFP/Getty Images) ( Par7535247 )

A Police official looks over object that was picked up by a remote control device, left, as they investigate an incident in Friday, April 19, 2013, in Watertown, Mass. in which shots were reported to have been fired. (AP Photo/Craig Ruttle) ( Police Converge Mass )

SWAT teams enter a suburban neighborhood to search an apartment for the remaining suspect in the Boston Marathon bombings in Watertown, Massachusetts April 19, 2013. Police killed one suspect in the Boston Marathon bombing during a shootout and were engaged in a house-to-house search for a second man on Friday in the Boston suburb of Watertown after a bloody night of shooting and explosions in the city's streets. REUTERS/Jessica Rinaldi ( USA-EXPLOSIONS/BOSTON )

Police cover as they surround a home while searching for a suspect in the Boston Marathon bombings in Watertown, Mass., Friday, April 19, 2013. The two suspects in the Boston Marathon bombing killed an MIT police officer and hurled explosives at police in a car chase and gun battle overnight that left one of them dead and his brother on the loose, authorities said Friday. (AP Photo/Charles Krupa) ( Police Converge Mass )

A woman reacts while being questioned by the Cambridge Police and other law enforcement agencies on April 19, 2013 near the home of suspect #2 on Norfolk Street in Cambridge, Massachusetts. Earlier, a Massachusetts Institute of Technology campus police officer was shot and killed late Thursday night at the school's campus in Cambridge. A short time later, police reported exchanging gunfire with alleged carjackers in Watertown, a city near Cambridge. According to reports, one suspect has been killed during a car chase and the police are seeking another - believed to be the same person (known as Suspect Two) wanted in connection with the deadly bombing at the Boston Marathon earlier this week. Police have confirmed that the dead assailant is Suspect One from the recently released marathon bombing photographs. (Photo by Jared Wickerham/Getty Images) ( 166982322 )

Police officers search house to house for the second suspect in the Boston Marathon bombings in a neighborhood of Watertown, Massachusetts April 19, 2013. Black Hawk helicopters and heavily armed police descended on a Boston suburb Friday in a massive search for an ethnic Chechen suspected in the Boston Marathon bombings, hours after his brother was killed by police in a late-night shootout. REUTERS/Brian Snyder ( USA-EXPLOSIONS/BOSTON )

Law enforcement officials depart the search area for Dzhokar Tsarnaev, the one remaining suspect in the Boston Marathon bombing, in Watertown, Massachusetts April 19, 2013. Police killed one suspect in the Boston Marathon bombing, Tamerlan Tsarneav, in a shootout and mounted house-to-house searches for the second man, his brother Dzhokar Tsarnaev, in the Boston suburb of Watertown, officials said on Friday, with much of the city under virtual lockdown after a bloody night of shooting and explosions in the streets. REUTERS/Lucas Jackson ( USA-EXPLOSIONS/BOSTON )

A woman carries a girl from their home as a SWAT team searching for a suspect in the Boston Marathon bombings enters the building in Watertown, Mass., Friday, April 19, 2013. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during their getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist. (AP Photo/Charles Krupa) ( APTOPIX Police Converge Mass )

Police guard the apartment building where the sister of the Boston marathon bombing suspects is believed to live as media cameras wait outside, Friday, April 19, 2013, in West New York, N.J. Federal investigators had removed items from the house earlier in the day, although there is no indication that the sister was involved in the bombing. (AP Photo/John Minchillo) ( Boston Marathon Suspects Sister )

Police presence grows in the neighborhoods of Watertown, Mass., Friday, April 19, 2013, as a massive search involving hundreds of heavily armed law enforcement officials continues for one of two suspects in the Boston Marathon bombing. A second suspect died in the early morning hours in a car chase and gun battle overnight that left one of them dead and his brother on the loose, authorities said Friday. (AP Photo/Craig Ruttle) ( Police Converge Mass )

Law enforcement officials depart with their K-9 units during the search for a suspect in the Boston Marathon bombing in Watertown, Massachusetts April 19, 2013. Police killed one suspect in the Boston Marathon bombing, Tamerlan Tsarneav, in a shootout and mounted house-to-house searches for the second man, his brother Dzhokar Tsarnaev, on Friday, with much of the city under virtual lockdown after a bloody night of shooting and explosions in the streets. REUTERS/Lucas Jackson ( USA-EXPLOSIONS/BOSTON )

A woman watches police as they search for the Boston Marathon bombing suspects in Watertown, Massachusetts April 19, 2013. Police on Friday killed one suspect in the Boston Marathon bombing during a shootout and mounted a house-to-house search for a second man in the suburb of Watertown after a bloody night of shooting and explosions in the city's streets. REUTERS/Brian Snyder ( USA-EXPLOSIONS/BOSTON )

A police helicopter flies over a neighborhood as a search for the second of two suspects wanted in the Boston Marathon bombings takes place April 19, 2013 in Watertown, Massachusetts. Dzhokhar and Tamerlan Tsarnaev, suspected of bombing the Boston marathon, appear to hail from Russia's war-torn Chechnya but had been in the United States for several years. Tamerlan reportedly died in a shootout with police on April 19 and his yournger brother fled and is being sought by police. STAN HONDA/AFP/Getty Images ( 519049661 )

A police officer evacuates a shoeless man holding a child as members of law enforcement conduct a search for a suspect in the Boston Marathon bombings, Friday, April 19, 2013, in Watertown, Mass. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist. (AP Photo/Matt Rourke) ( Police Converge Mass )

Police monitor a locked down street as a search for the second of two suspects wanted in the Boston Marathon bombings takes place on April 19, 2013 in Watertown, Massachusetts. Dzhokhar and Tamerlan Tsarnaev, suspected of bombing the Boston marathon, appear to hail from Russia's war-torn Chechnya but had been in the United States for several years. Tamerlan reportedly died in a shootout with police on April 19 and his yournger brother fled and is being sought by police. STAN HONDA/AFP/Getty Images ( 519049663 )

A police officer points his weapon at a residence as he conducts a search for a suspect in the Boston Marathon bombings, Friday, April 19, 2013, in Watertown, Mass. The two suspects in the Boston Marathon bombing killed an MIT police officer and hurled explosives at police in a car chase and gun battle overnight that left one of them dead and his brother on the loose, authorities said Friday as thousands of officers swarmed the streets in a manhunt that all but paralyzed the Boston area. (AP Photo/Matt Rourke) ( Police Converge Mass )

FBI agents escort Ruslan Tsarni, uncle of the Boston Marathon bombing suspects, second from right, into his home in Montgomery Village in Md. Friday, April, 19, 2013. The brothers, who came from a Russian region near Chechnya, lived together on Norfolk Street in Cambridge, Mass. They had been in the country for about a decade, according to an uncle, Ruslan Tsarni of Montgomery Village, Md. (AP Photo/Jose Luis Magana) ( Boston Marathon Suspects )

In this undated photo provided by Robin Young, Dzhokhar A. Tsarnaev, left, and Here & Now host Robin Youngís nephew, right, pose for a photo after graduating from Cambridge Rindge and Latin High School. Tsarnaev has been identified as the surviving suspect in the marathon bombings. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, April 19, 2013. (AP Photo/Robin Young) ( Police Converge Mass )

A photograph of Djohar Tsarnaev, who is believed to be Dzhokhar Tsarnaev, a suspect in the Boston Marathon bombing, is seen on his page of Russian social networking site Vkontakte (VK), as pictured on a monitor and a mobile phone in St. Petersburg April 19, 2013. Tsarnaev posted links to Islamic websites and others calling for Chechen independence on what appears to be his page on the site. Police launched a massive manhunt for Tsarnaev, 19, after killing his older brother Tamerlan Tsarnaev in a shootout overnight. REUTERS/Alexander Demianchuk ( USA-EXPLOSIONS/SUSPECT-SITE )

A police officer runs with his weapon drawn as he conduct a search for a suspect in the Boston Marathon bombings, Friday, April 19, 2013, in Watertown, Mass.(AP Photo/Matt Rourke) ( Police Converge Mass )

FBI agents search homes for the Boston Marathon bombing suspects in Watertown, Massachusetts April 19, 2013. REUTERS/Brian Snyder ( USA-EXPLOSIONS/BOSTON )

SWAT officers from suburban communities aid Boston police officers in keeping guard at the nearly deserted South Station area of Boston, Massachusetts, April 19, 2013, as the manhunt continues for Dzhokar Tsarnaev, the remaining suspect in the Boston Marathon bombings.REUTERS/Neal Hamberg ( USA-EXPLOSIONS/BOSTON )

SWAT officers from suburban communities aid Boston police officers in keeping guard at the nearly deserted South Station area of Boston, Massachusetts, April 19, 2013, as the manhunt continues for Dzhokar Tsarnaev, the remaining suspect in the Boston Marathon bombings. REUTERS/Neal Hamberg ( USA-EXPLOSIONS/BOSTON )

Local residents watch as police officers search homes for the Boston Marathon bombing suspects in Watertown, Massachusetts April 19, 2013. REUTERS/Jessica Rinaldi ( USA-EXPLOSIONS/BOSTON )

A police officer and a Federal Bureau of Investigation agent run as they conduct a search for a suspect in the Boston Marathon bombings, Friday, April 19, 2013, in Watertown, Mass. (AP Photo/Matt Rourke) ( Police Converge Mass )

People are evacuated from a home near to a home police thought the one remaining suspect might have been hiding on April 19, 2013 in Watertown, Massachusetts. (Photo by Mario Tama/Getty Images) ( 166988888 )

(L-R) Stranded travelers Angel Valentin and Rosa Valentin of North Dakota and Puna Nepal and Tika Lamichaney of New York stand outside South Station on April 19, 2013 in Boston, Massachusetts. South Station was shut down and heavily guarded with police in response to the early morning shootings in Cambridge and Watertown, Massachusetts. (Photo by Kayana Szymczak/Getty Images) ( 166989221 )

A Boston Police officer and detective search South Station for suspicious material after two bullets were found outside of the T stop on April 19, 2013 in Boston, Massachusetts. (Photo by Kayana Szymczak/Getty Images) ( 166989228 )

A Boston SWAT team member takes up as posistion as they search for 19-year-old bombing suspect Dzhokhar A. Tsarnaev on April 19, 2013 in Watertown, Massachusetts. (Photo by Mario Tama/Getty Images) ( 166989246 )

Stranded travelers wait outside South Station on April 19, 2013 in Boston, Massachusetts. South Station was shut down and heavily guarded with police in response to the early morning shootings in Cambridge and Watertown, Massachusetts. (Photo by Kayana Szymczak/Getty Images) ( 166989250 )

A barefooted woman runs for cover as police surround a home while searching for a suspect in the Boston Marathon bombings in Watertown, Mass., Friday, April 19, 2013. (AP Photo/Charles Krupa) ( APTOPIX Police Converge Mass )

A member of the Cambridge police bomb squad, right, deploys a robot on Norfolk Street during a search for searching a suspect in the Boston Marathon bombings in Cambridge, Mass., Friday, April 19, 2013.(AP Photo/Michael Dwyer) ( Police Converge Mass )

The usually busy Kenmore Square in Boston is virtually deserted at lunchtime Friday, April 19, 2013, during a call for "shelter-in-place" for Boston and some area communities. (AP Photo/Elise Amendola) ( APTOPIX Police Converge Mass )

A U.S. military helicopter flies above Watertown Mall as law enforcement agencies search for 19-year-old bombing suspect Dzhokhar A. Tsarnaev on April 19, 2013 in Watertown, Massachusetts. (Photo by Mario Tama/Getty Images) ( 167006474 )

A person watches from the window of a home as a SWAT team member keeps watch while searching for 19-year-old bombing suspect Dzhokhar A. Tsarnaev on April 19, 2013 in Watertown, Massachusetts. (Photo by Mario Tama/Getty Images) ( 167006807 )

Members of a police SWAT team conduct a door-to-door search for 19-year-old Boston Marathon bombing suspect Dzhokhar A. Tsarnaev on April 19, 2013 in Watertown, Massachusetts. (Photo by Spencer Platt/Getty Images) ( 167010259 )

People look through a window after a flash-bang was set off at 410 Norfolk Street in Cambridge, Massachusetts April 19, 2013. REUTERS/Shannon Stapleton ( USA-EXPLOSIONS/BOSTON )

Law enforcement officers react to what was initially thought to be a threatening suspect on Arsenal Street, in the search area for Dzhokar Tsarnaev, the one remaining suspect in the Boston Marathon bombing, in Watertown, Massachusetts April 19, 2013. REUTERS/Lucas Jackson ( USA-EXPLOSIONS/BOSTON )

Law enforcement officers place themselves in an overhead position on Arsenal St, in the search area for Dzhokar Tsarnaev, the one remaining suspect in the Boston Marathon bombing, in Watertown, Massachusetts April 19, 2013. REUTERS/Lucas Jackson ( USA-EXPLOSIONS/BOSTON )

Law enforcement officers briefly detain a suspect to verify his ID on Arsenal St, in the search area for Dzhokar Tsarnaev, the one remaining suspect in the Boston Marathon bombing, in Watertown, Massachusetts April 19, 2013. REUTERS/Lucas Jackson ( USA-EXPLOSIONS/BOSTON )

Members of the media take cover on the instruction of law enforcement officers while covering a police reaction to a suspect on Arsenal St, in the search area for Dzhokar Tsarnaev, the one remaining suspect in the Boston Marathon bombing, in Watertown, Massachusetts April 19, 2013. REUTERS/Lucas Jackson ( USA-EXPLOSIONS/BOSTON )

West New York Police officers collect evidence from the apartment of Alina Tsarnaeva, sister of the Boston Marathon bombing suspects, in West New York, New Jersey April 19, 2013. REUTERS/Eduardo Munoz ( USA-EXPLOSIONS/BOSTON-SHOOTING )

Anzor Tsarnaev, who calls himself father of Dzhokhar and Tamerlan Tsarnaev, the two suspects in the Boston Marathon bombings, reacts as he gives an interview in Makhachkala in this video grab from the footage via Reuters TV, April 19, 2013. REUTERS/Reuters TV ( USA-EXPLOSIONS/SUSPECT-SITE )

The Cape Cod Police Department SWAT team search houses for the second of two suspects wanted in the Boston Marathon bombings takes place April 19, 2013 in Watertown, Massachusetts. AFP PHOTO / TIMOTHY A. CLARY/AFP/Getty Images ( 519056784 )

The Cape Cod, Massachusetts, Police Department SWAT team search houses for the second of two suspects wanted in the Boston Marathon bombings takes place April 19, 2013 in Watertown, Massachusetts. AFP PHOTO / TIMOTHY A. CLARY/AFP/Getty Images ( 519057284 )

The Cape Cod Police Department SWAT team search houses for the second of two suspects wanted in the Boston Marathon bombings takes place April 19, 2013 in Watertown, Massachusetts. AFP PHOTO / TIMOTHY A. CLARY/AFP/Getty Images ( 519057516 )

Maret Tsarnaeva, an aunt of the two suspects in the Boston Marathon bombing, holds a reporter's smart phone which displays a scene from the bomb site, as she speaks to journalists in the lobby of her apartment building in Toronto on Friday April 19, 2013. Tamerlan Tsarnaev, a 26-year-old who had been known to the FBI as Suspect No. 1 and was seen in surveillance footage in a black baseball cap, was killed overnight, officials said. His brother, a 19-year-old college student who was dubbed Suspect No. 2 and was seen wearing a white, backward baseball cap in the images from Monday's deadly bombing at the marathon finish line, escaped. (AP Photo/The Canadian Press, Chris Young) ( Police Converge Mass )

Ruslan Tsarni, uncle of the Boston Marathon bombing suspect, speaks with the media outside his home in Montgomery Village in Md. Friday, April, 19, 2013. In a passionate plea, Tsarni urged his nephew to turn himself in Friday, saying he had brought shame to the family and the entire Chechen ethnicity. (AP Photo/Jose Luis Magana) ( Boston Marathon Suspects Uncle )

State Police arrest a man walking at the UMASS-Dartmouth campus during their sweep of the university Friday, April 19, 2013, in Dartmouth, Mass. (AP Photo/Standard Times, Peter Pereira) ( Police Converge Mass )

A New York State Police robot removes suspicious packages from a car in Niagara Falls, N.Y., Friday, April 19, 2013. Trooper Jeffrey Bebak says that a state police bomb disposal team is using a robot to remove items from the car that was stopped earlier in the morning. Bebak says two men are being questioned by police but he has no other details. The response came amid an intense manhunt in Massachusetts one of the Boston Marathon bombers. (AP Photo/David Duprey) ( Niagara Falls Car Search )

In this Feb. 17, 2010, photo, Tamerlan Tsarnaev, left, smiles after accepting the trophy for winning the 2010 New England Golden Gloves Championship from Dr. Joseph Downes, right, in Lowell, Mass. Tsarnaev, 26, who had been known to the FBI as Suspect No. 1 in the Boston Marathon Explosions and was seen in surveillance footage in a black baseball cap, was killed overnight on Friday, April 19, 2013, officials said. (AP Photo/The Lowell Sun, Julia Malakie) ( Boston Marathon Explosions Suspect )

This undated image released by the FBI shows Boston Marathon bombing suspect Dzhokhar Tsarnaev, who police have taken into April 19, 2013, according to the Boston Police Department. Police said April 19, 2013 they had detained a teenaged suspect in the Boston marathon bombings after a showdown at a house in the suburbs. "Suspect in custody. Officers sweeping the area. Stand by for further info," Boston police said on its Twitter account after 19-year-old Dzhokhar Tsarnaev was taken away to applause from people near the scene in Watertown. AFP PHOTO / FBI ( 519064145 )

Jane Cosmas, 4-years-old, of Somerville, Massachusetts, walks amidst hundreds of chalk messages written by passersby about the Boston Marathon bombings on Newbury Street near the scene of the blasts in Boston, Massachusetts, April 20, 2013. REUTERS/Jim Bourg ( USA-EXPLOSIONS/BOSTON )