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WATERTOWN, MA - APRIL 20: Investigators work around the boat where Dzhokhar A. Tsarnaev was found hiding after a massive manhunt, in the backyard of a Franklin Street home, in an aerial view April 20, 2013 in Watertown, Massachusetts. A manhunt for Dzhokhar A. Tsarnaev, 19, a suspect in the Boston Marathon bombing ended after he was apprehended on a boat parked on a residential property in Watertown, Massachusetts. His brother Tamerlan Tsarnaev, 26, the other suspect, was shot and killed after a car chase and shootout with police. The bombing, on April 15 at the finish line of the marathon, killed three people and wounded at least 170. (Photo by Darren McCollester/Getty Images) ( 167106743 )

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 )

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) ( Boston Marathon Explosions )

WATERTOWN, MA - APRIL 19: In this handout provided by the Massachusetts State Police, the boat in which Boston Marathon bombing suspect Dzhokhar A. Tsarnaev was hiding is seen from a police helicopter on Franklin Street on April 19, 2013 in Watertown, Massachusetts. A manhunt for Dzhokhar A. Tsarnaev, 19, a suspect in the Boston Marathon bombing ended after he was apprehended on a boat parked on a residential property. His brother Tamerlan Tsarnaev, 26, the other suspect, was shot and killed after a car chase and shootout with police. The bombing, on April 15 at the finish line of the marathon, killed three people and wounded at least 170 (Photo by Massachusetts State Police via Getty Images) ( 167104000 )

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 )

This Friday, April 19, 2013 image made available by the Massachusetts State Police shows the boat where 19-year-old Boston Marathon bombing suspect, Dzhokhar Tsarnaev, was hiding 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 )

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 )

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 )

A sign in a Boston hotel lobby on April 20, 2013, shows a photo of Dzhokhar A. Tsarnaev, 19, the morning after he was captured. Thousands of heavily armed police staged an intense manhunt Friday for the Chechen teenager suspected in the Boston marathon bombings with his brother, who was killed in a shootout. Dzhokhar defied the massive force after his 26-year-old brother Tamerlan was shot and suffered critical injuries from explosives believed to have been strapped to his body. TIMOTHY A. CLARY/AFP/Getty Images ( 519080816 )

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 )

BOSTON, MA - APRIL 20: People gather at a makeshift memorial for victims near the site of the Boston Marathon bombings a day after the second suspect was captured on April 20, 2013 in Boston, Massachusetts. A manhunt for Dzhokhar A. Tsarnaev, 19, a suspect in the Boston Marathon bombing ended after he was apprehended on a boat parked on a residential property in Watertown, Massachusetts. His brother Tamerlan Tsarnaev, 26, the other suspect, was shot and killed after a car chase and shootout with police. The bombing, on April 15 at the finish line of the marathon, killed three people and wounded at least 170. (Photo by Mario Tama/Getty Images) ( 167107846 )