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FBI agents leave an apartment building adjacent to a makeshift memorial for Michael Brown on Saturday, Aug. 16, 2014, located at the site where Brown was shot by police a week ago in Ferguson, Mo. Brown's shooting in the middle of a street following a suspected robbery of a box of cigars from a nearby market has sparked a week of protests, riots and looting in the St. Louis suburb. (AP Photo/Charlie Riedel) ( Police Shooting Missouri )

People gather next to a makeshift memorial for Michael Brown Saturday, Aug. 16, 2014, located at the site where Brown was shot by police a week ago in Ferguson, Mo. Brown's shooting in the middle of a street following a suspected robbery of a box of cigars from a nearby market has sparked a week of protests, riots and looting in the St. Louis suburb. (AP Photo/Charlie Riedel) ( Police Shooting Missouri )

A man wear buttons in support of Michael Brown Saturday, Aug. 16, 2014, as he visits the site where Brown was shot by a police officer a week ago in Ferguson, Mo. Brown's shooting in the middle of a street following a suspected robbery of a box of cigars from a nearby market has sparked a week of protests, riots and looting in the St. Louis suburb. (AP Photo/Charlie Riedel) ( Police Shooting Missouri )

FERGUSON, MO - AUGUST 16: Business owners carry assault weapons to protect their grocery store after another night of rioting and looting following protests over the shooting death of Michael Brown on August 16, 2014 in Ferguson, Missouri. Looters ransacked several businesses for several hours as police held a position nearby with military grade weapons and armored personnel carriers (APC). Violent outbreaks have taken place almost nightly in Ferguson since the shooting death of Brown by a Ferguson police officer on August 9. (Photo by Scott Olson/Getty Images) ( 453689558 )

FERGUSON, MO - AUGUST 16: Business owner Mustafa Alshalabi cleans damage to his store, Sam's Meat Market, after it was looted during another night of rioting following protests over the shooting death of Michael Brown on August 16, 2014 in Ferguson, Missouri. Alshalabi is carrying a firearm on his side in order to protect his property. Looters ransacked several businesses for several hours as police held a position nearby with military grade weapons and armored personnel carriers (APC). Violent outbreaks have taken place almost nightly in Ferguson since the shooting death of Brown by a Ferguson police officer on August 9. (Photo by Scott Olson/Getty Images) *** BESTPIX *** ( 453689624 )

FERGUSON, MO - AUGUST 16: The owner of the Beauty Town store boards up the business after it was looted during another night of rioting following protests over the shooting death of Michael Brown on August 16, 2014 in Ferguson, Missouri. Looters ransacked several businesses for several hours as police held a position nearby with military grade weapons and armored personnel carriers (APC). Violent outbreaks have taken place almost nightly in Ferguson since the shooting death of Brown by a Ferguson police officer on August 9. (Photo by Scott Olson/Getty Images) ( 453690994 )

FERGUSON, MO - AUGUST 15: A demonstrator walks through smoke launched by police after a skirmish on August 15, 2014 in Ferguson, Missouri. Police sprayed pepper spray, shot smoke, gas and flash grenades at protestors before retreating. Several businesses were looted following the skirmish as police held their position nearby. Violent outbreaks have taken place in Ferguson since the shooting death of Michael Brown by a Ferguson police officer on August 9. (Photo by Scott Olson/Getty Images) ( 453674830 )

FERGUSON, MO - AUGUST 16: People loot the Ferguson Market and Liquor store on August 16, 2014 in Ferguson, Missouri. Several businesses were looted as police held their position nearby. Violent outbreaks have taken place almost daily in Ferguson since the shooting of Michael Brown by a Ferguson police officer on August 9. (Photo by Scott Olson/Getty Images) ( 453677744 )

FERGUSON, MO - AUGUST 15: Missouri State Highway Patrol officers listen to taunts from demonstrators during a protest over the shooting of Michael Williams on August 15, 2014 in Ferguson, Missouri. As the taunts became more aggressive the troopers called in the county police then left. County police ended up shooting pepper spray, smoke, gas and flash grenades at protestors before retreating. Several businesses were looted as the county police sat in formation with armored personnel carriers (APC) nearby. Violent outbreaks have taken place in Ferguson since the shooting death of Brown by a Ferguson police officer on August 9. (Photo by Scott Olson/Getty Images) ( 453678316 )

Protestors stand in the middle of West Florissant Avenue in Ferguson, refusing to leave despite police orders early Saturday, Aug. 16, 2014. (AP Photo/St. Louis Post-Dispatch, Robert Cohen) ( Police Shooting Missouri )

FERGUSON, MO - AUGUST 15: Demonstrators taunt police during a protest over the shooting death of Michael Williams on August 15, 2014 in Ferguson, Missouri, Police shot pepper spray, smoke, gas and flash grenades at protestors before retreating. Several businesses were looted as the county police sat nearby with armored personnel carriers (APC). Violent outbreaks have taken place in Ferguson since the shooting death of Brown by a Ferguson police officer on August 9. (Photo by Scott Olson/Getty Images) ( 453681886 )

FERGUSON, MO - AUGUST 14: Capt. Ronald Johnson of the Missouri State Highway Patrol, who was appointed by the governor to take control of security operations in the city of Ferguson, walks among demonstrators gathered along West Florissant Avenue on August 14, 2014 in Ferguson, Missouri. Violent protests have erupted along West Florissant in Ferguson each of the last four nights as demonstrators express outrage over the shooting death of Michael Brown by a Ferguson police officer on August 9.The governor appointed Johnson after receiving numerous complaints about the excessive show and use of force by the police against protestors and the news media covering the demonstrations. Senator Claire McCaskill (D-MO) today called for the demilitarization of the police. (Photo by Scott Olson/Getty Images) ( 453627478 )

FERGUSON, MO - AUGUST 15: Police confront demonstrators during a protest over the shooting of Michael Williams on August 15, 2014 in Ferguson, Missouri. County police shot pepper spray, smoke, gas and flash grenades at protestors before retreating. Several businesses were looted as county police watched from their armored personnel carriers (APC) parked nearby. Violent outbreaks have taken place in Ferguson since the shooting death of Brown by a Ferguson police officer on August 9. (Photo by Scott Olson/Getty Images) ( 453680352 )

FERGUSON, MO - AUGUST 15: A convoy of armored personnel carriers (APC) carrying county police arrive after Missouri State Highway Patrol officers were taunted by demonstrators during a protest over the shooting of Michael Williams on August 15, 2014 in Ferguson, Missouri. As the taunts became more aggressive the troopers called in the county police then left the area. County police ended up shooting pepper spray, smoke, gas and flash grenades at protestors before retreating. Several businesses were looted as the county police watched from their APC parked nearby. Violent outbreaks have taken place in Ferguson since the shooting death of Brown by a Ferguson police officer on August 9. (Photo by Scott Olson/Getty Images) ( 453680448 )

FERGUSON, MO - AUGUST 15: A Police officer confronts a demonstrators during a protest over the shooting death of Michael Williams on August 15, 2014 in Ferguson, Missouri. Police shot pepper spray, smoke, gas and flash grenades at protestors before retreating. Several businesses were looted as the county police sat nearby with armored personnel carriers (APC). Violent outbreaks have taken place in Ferguson since the shooting death of Brown by a Ferguson police officer on August 9. (Photo by Scott Olson/Getty Images) ( 453681834 )

Isaiah King Ivy, 3, makes his shirt a mask as he participates in demonstrations with his north St. Louis County family on West Florissant Avenue in Ferguson on Friday, Aug. 15, 2014. (AP Photo/St. Louis Post-Dispatch, Robert Cohen) ( Police Shooting Missouri )

FERGUSON, MO - AUGUST 15: Demonstrators gather along West Florissant Avenue to protest the shooting of Michael Brown on August 15, 2014 in Ferguson, Missouri. Brown was shot and killed by a Ferguson police officer on August 9. Tonight's demonstration again ended with protestors clashing with police followed by more looting. (Photo by Scott Olson/Getty Images) ( 453673858 )

Many people drove down the street honking their horns, raising their arms, and holding signs on W. Florissant in Ferguson on Thursday evening, Aug. 14, 2014, as some demonstrators stood in the middle of the street. (AP Photo/St. Louis Post-Dispatch, J.B. Forbes) ( Police Shooting Missouri )

Protesters march down the middle of a street, Friday, Aug. 15, 2014, in front of a convenience store that was looted and burned following the shooting death of Michael Brown by police nearly a week ago in Ferguson, Mo. (AP Photo/Charlie Riedel) ( APTOPIX Police Shooting Missouri )

FERGUSON, MO - AUGUST 15: Demonstrators gather along West Florissant Avenue to protest the shooting of Michael Brown on August 15, 2014 in Ferguson, Missouri. Brown was shot and killed by a Ferguson police officer on August 9. Tonight's demonstration again ended with protestors clashing with police followed by more looting. (Photo by Scott Olson/Getty Images) ( 453673840 )

Passengers in a car raise their hands as they pass the memorial where Michael Brown was shot dead in the Canfield Green Apartments on Friday, Aug. 15, 2014. (AP Photo/St. Louis Post-Dispatch, Robert Cohen) ( Police Shooting Missouri )

FERGUSON, MO - AUGUST 14: Nineteen-year-old Emanuel Freeman looks out from a balcony in his apartment building as demonstators rally in the street where eighteen-year-old Michael Brown was killed on August 14, 2014 in Ferguson, Missouri. Brown, who was not armed, died in the street directly in front of the balcony after being shot by a Ferguson police officer on August 9. Police in Ferguson have changed their procedure for dealing with the protests after being chastised for a heavy-handed approach which has resulted in four days of violence. Today three police cars and four officers on foot led the way during a protest march. (Photo by Scott Olson/Getty Images) ***BESTPIX*** ( 453619324 )

Protesters pass by a Los Angeles Police Department car as they walk up Crenshaw Blvd. to protest the shooting of an unarmed man in Ferguson, Mo., and other victims of police shootings, Thursday, Aug. 14, 2014, in Los Angeles. (AP Photo/Mark J. Terrill) ( Missouri Shooting California Vigil )

Demonstrators peacefully gather Thursday, Aug. 14, 2014, at the site where Michael Brown was shot and killed by police in Ferguson, Mo. The Missouri Highway Patrol seized control of a St. Louis suburb Thursday, stripping local police of their law-enforcement authority after four days of clashes between officers in riot gear and furious crowds protesting the death of an unarmed black teen shot by an officer. (AP Photo/Jeff Roberson) ( Police Shooting Missouri Vigil )

Jay Mitchell, of Pagedale, Mo., speaks and solicits a response of hands in the air from the crowd Thursday, Aug. 14, 2014, in St. Louis during a peace vigil and moment of silence for Michael Brown, an unarmed teenager who was shot and killed by Ferguson, Mo., police Saturday. Vigils have been held across the country for people who died at the hands of police. (AP Photo/St. Louis Post-Dispatch, Christian Gooden) ( Police Shooting Missouri Vigil )

Isaiah King Ivy, 3, makes his shirt a mask as he participates in demonstrations with his north St. Louis County family on West Florissant Avenue in Ferguson on Friday, Aug. 15, 2014. (AP Photo/St. Louis Post-Dispatch, Robert Cohen) ( Police Shooting Missouri )

A large crowd listens during a vigil at Hart Plaza in downtown Detroit on Thursday Aug. 14, 2014. Vigils are being held across the country in the wake of the shooting death of Michael Brown by a police officer in Ferguson, Mo, (AP Photo/Detroit Free Press, Ryan Garza) ( Missouri Shooting Michigan Vigil )

FERGUSON, MO - AUGUST 15: Capt. Ronald Johnson of the Missouri State Highway Patrol (L) and Governor Jay Nixon (R) of Missouri speak to the media on August 15, 2014 in St. Louis, Missouri. Violent protests have erupted in the city following the shooting death of Michael Brown by a Ferguson police officer on August 9th. Governor Nixon appointed Capt. Johnson to take control of security operations in the city of Fergusonm after receiving numerous complaints about the excessive show and use of force by the police against protestors and the news media covering the demonstrations. (Photo by Scott Olson/Getty Images) ( 453655246 )

CHANGES THE WORD SEIZED TO TOOK - Missouri State Highway Patrol Capt. Ronald Johnson addresses the crowd of protesters, asking them to stay on the sidewalk and not block traffic Thursday, Aug. 14, 2014, in Ferguson, Mo. The Missouri Highway Patrol seized took of a St. Louis suburb Thursday, stripping local police of their law-enforcement authority after four days of clashes between officers in riot gear and furious crowds protesting the death of an unarmed black teen shot by an officer. (AP Photo/St. Louis Post-Dispatch, David Carson) ( Police Shooting Missouri )

Ferguson Police Chief Thomas Jackson, left, gets in a vehicle to drive away after releasing the name of the the officer accused of fatally shooting Michael Brown, an unarmed black teenager, during a news conference Friday, Aug. 15, 2014, in Ferguson, Mo. Jackson announced that the officer's name is Darren Wilson. (AP Photo/Jeff Roberson) ( Police Shooting Missouri )

FERGUSON, MO - AUGUST 15: Standing in the parking lot of a gas station which was burned during rioting, Ferguson Police Chief Thomas Jackson announces the name of the Ferguson police officer responsible for the August 9, shooting death of teenager Michael Brown on August 15, 2014 in Ferguson, Missouri. The officer was identified as Darren Wilson, a six year veteran of the police department. Brown's killing sparked several days of violent protests in the city. (Photo by Scott Olson/Getty Images) ( 453643384 )

Chelsea Johnson, from St. Louis, holds up a shirt protesting the shooting death of Michael Brown by police nearly a week ago in Ferguson, Mo., Friday, Aug. 15, 2014, in Ferguson, Mo. (AP Photo/Charlie Riedel) ( Police Shooting Missouri )