St Louis County police officers arrest an anti-police demonstrator, Aug.11, 2015, in Ferguson, Mo. Lucas Jackson/Reuters

Demonstrators, marking the one-year anniversary of the shooting of Michael Brown, protest along West Florrisant Street, Aug. 10, 2015, in Ferguson, Mo. Scott Olson/Getty Images

A young protester marches in downtown, Aug. 10, 2015, St. Louis. Rick Wilking/Reuters

St. Louis County Police officers, outfitted in tactical equipment, monitor the situation during a civil disobedience action on West Florissant Avenue, Aug.10, 2015, in Ferguson, Mo. Michael B. Thomas/AFP/Getty Images

Officers and protesters face off along West Florissant Avenue, Aug. 10, 2015, in Ferguson, Mo. Jeff Roberson/AP Photo

A demonstrator, marking the one-year anniversary of the shooting of Michael Brown, confronts police during a protest along West Florrisant Street, Aug. 10, 2015 in Ferguson, Mo. Scott Olson/Getty Images

Demonstrators, marking the one-year anniversary of the shooting of Michael Brown, protest along West Florrisant Street, Aug. 10, 2015 in Ferguson, Mo. Scott Olson/Getty Images

Police arrest more than 50 demonstrators who blocked traffic on Interstate 70 outside of Ferguson to mark the one-year anniversary of the shooting of Michael Brown, August 10, 2015, near Earth City, Mo. Scott Olson/Getty Images

Amarion Allen, 11-years-old, stands in front of a police line shortly before shots were fired in a police-officer involved shooting, Aug. 9, 2015, in Ferguson, Mo. Rick Wilking/Reuters

Demonstrators, marking the one-year anniversary of the shooting of Michael Brown, march along West Florrisant Street in a driving rain, Aug. 9, 2015, in Ferguson, Mo. Scott Olson/Getty Images

St. Louis County Police and Missouri State Highway Patrol troopers stand guard as protesters march on West Florissant Avenue, Aug. 9, 2015, in Ferguson, Mo. Michael B. Thomas/AFP/Getty Images

Demonstrators participate in a protest march on West Florissant Avenue, Aug. 9, 2015, in Ferguson, Mo. Michael B.Thomas/AFP/Getty Images

Police take cover as a barrage of gunfire erupts along West Florrisant Street during a demonstration to mark the 1-year anniversary of the shooting of Michael Brown, Aug. 9, 2015, in Ferguson, Mo. Scott Olson/Getty Images

Demonstrators, marking the one-year anniversary of the shooting of Michael Brown, face off with police during a protest along West Florrisant Street, Aug. 9, 2015, in Ferguson, Mo. Scott Olson/Getty Images

A vehicle leaves the Canfield Green Apartments where Michael Brown was killed following a memorial service marking the anniversary of his death, Aug. 9, 2015, in Ferguson, Mo. Scott Olson/Getty Images

Michael Brown Sr., front and center, leads a march from the location where his son Michael Brown Jr. was shot and killed following a memorial service marking the anniversary of his death, Aug. 9, 2015, in Ferguson, Mo. Scott Olson/Getty Images

Roses lie next to a plaque in the sidewalk which honors Michael Brown following a memorial service marking the anniversary of Brown's death, Aug. 9, 2015, in Ferguson, Mo. Scott Olson/Getty Images

Anthony Shahid, left, and Zaki Baruti walk with other demonstrators through the street near the Buzz Westfall Justice Center where a grand jury will begin looking at the circumstances surrounding the fatal police shooting of an unarmed teenager Michael Brown on Aug. 21, 2014 in Clayton, Mo. Joe Raedle/Getty Images

In this photo taken with a long exposure, protesters march in the street as lightning flashes in the distance in Ferguson, Mo., on Aug. 20, 2014. Jeff Roberson/AP Photo

A demonstrator, who declined to give her name, holds a mirror up to police officers forming a containment line in Oakland, Calif. on Aug. 20, 2014 during a protest by several hundred against the shooting of Michael Brown, an unarmed black 18-year old by a white police officer in Ferguson, Mo. Noah Berger/AP Photo

Demonstrators pray outside of the Buzz Westfall Justice Center where a grand jury is expected to begin looking at the circumstances surrounding the fatal police shooting of an unarmed teenager, Aug. 20, 2014 in Clayton, Missouri. Scott Olson/Getty Images

Protesters lay on the ground to draw lines around their bodies as they and other demonstrators protest outside of the Buzz Westfall Justice Center where a grand jury will begin looking at the circumstances surrounding the fatal police shooting of an unarmed teenager, Aug. 20, 2014, in Clayton, Missouri. Joe Raedle/Getty Images

A demonstrator is arrested while protesting the killing of teenager Michael Brown, Aug. 19, 2014, in Ferguson, Missouri. Scott Olson/Getty Images

Police fire tear gas in the direction of where bottles were thrown from crowds gathered near the QuikTrip on W. Florissant Avenue, Aug. 18, 2014. David Carson/ST. Louis Post-Dispatch/Polaris

Police attempt to control demonstrators protesting, Aug. 18, 2014, in Ferguson, Mo. Scott Olson/Getty Images

A demonstrator reacts during a protest on West Florissant Avenue in Ferguson, Mo., Aug. 18, 2014. Michael B. Thomas/AFP/Getty Images

Demonstrators gesture during a protest on West Florissant Avenue in Ferguson, Mo., Aug. 18, 2014. Michael B. Thomas/AFP/Getty Images

Law enforcement officers watch on during a protest on West Florissant Avenue in Ferguson, Mo., Aug. 18, 2014. Michael B. Thomas/AFP/Getty Images

Tear gas is deployed after police were fired upon, Aug. 18, 2014, in Ferguson, Mo. Jeff Roberson/AP Photo

Getty Images staff photographer Scott Olson is placed into a paddy wagon after being arrested by police as he covers the demonstration following the shooting death of Michael Brown on Aug. 18, 2014 in Ferguson, Mo. Joe Raedle/Getty Images

Demonstrators protesting the killing of teenager Michael Brown by a police officer try to stand their ground despite being overcome by tear gas, Aug. 17, 2014, in Ferguson, Mo. Scott Olson/Getty Images

Tear gas surrounds a woman kneeling in the street with her hands in the air after a protest, Aug. 17, 2014, in Ferguson, Mo. Scott Olson/Getty Images

Police advance on demonstrators protesting the killing of teenager Michael Brown, Aug. 17, 2014 in Ferguson, Mo. Scott Olson/Getty Images

Police wait to advance after tear gas was used to disperse a crowd, Aug. 17, 2014, during a protest. Charlie Riedel/AP Photo

A protestor runs down the street to escape tear gas fired at demonstrators, Aug. 17, 2014, in Ferguson, Mo. Robert Cohen/St. Louis Post-Dispatch/AP Photo

Tactical trucks move down the street through tear gas in Ferguson, Mo., Aug. 17, 2014. J.B. Forbes/St. Louis Post-Dispatch/AP Photo

Protesters take refuge in a McDonald's restaurant after police fired tear gas to disperse a crowd, Aug. 17, 2014. Charlie Riedel/AP Photo

Police wait to advance after tear gas was used to dispersed a crowd, Aug. 17, 2014, during a protest. Charlie Riedel/AP Photo

A woman tries to recover after being hit by tear gas after police dispersed a crowd, Aug. 17, 2014, during a protest. Charlie Riedel/AP Photo

Police wait to advance after tear gas was used to disperse a crowd, Aug. 17, 2014, during a protest. Charlie Riedel/AP Photo

Protesters run when the police shoot tear gas in Ferguson, Mo., Aug. 17, 2014. J.B. Forbes/St. Louis Post-Dispatch/AP Photo

A law enforcement officer watches Sunday, Aug. 17, 2014, as tear gas is fired to disperse a crowd protesting the shooting of teenager Michael Brown last Saturday in Ferguson, Mo. Charlie Riedel/AP Photo

People defy a curfew Sunday, Aug. 17, 2014, before smoke and tear gas was fired to disperse a crowd protesting the shooting of teenager Michael Brown last Saturday in Ferguson, Mo. Charlie Riedel/AP Photo

Police stand guard before the mandatory midnight curfew on August 16, 2014 in Ferguson, Mo. Scott Olson/Getty Images

Demonstrators protest on Aug. 16, 2014, at the site where Michael Brown was killed on Canfield Dr. in Ferguson, Mo. Joshua Lott/AFP/Getty Images

Rev. Jesse Jackson pauses at a makeshift memorial for Michael Brown on Aug. 16, 2014, located at the site where Brown was shot by police a week ago in Ferguson, Mo. Charlie Riedel/AP Photo

A FBI agent speaks to residents on Aug. 16, 2014, as the bureau investigates the shooting death of 18-year-old Michael Brown at the location where he was killed on Canfield Dr. in Ferguson, Mo. AFP/Getty Images

A demonstrator confronts police during a protest over the shooting of Michael Brown on Aug. 15, 2014 in Ferguson, Mo. Scott Olson/Getty Images

Missouri Highway Patrol Capt. Ron Johnson, looks at the crowd of protesters on Aug. 15, 2014. Courtesy of Jeffrey Brown

Demonstrators confront police with their arms raised during on-going demonstrations to protest against the shooting of Michael Brown, in Ferguson, Aug. 16, 2014. Lucas Jackson / Reuters

Passengers in a car raise their hands as they pass the memorial where Michael Brown was shot dead in the Canfield Green Apartments on Aug. 15, 2014. Robert Cohen/AP Photo

A protester holds up a clenched fist 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. Charlie Riedel/AP Photo

A sea of cars continued to roll down West Florissant Avenue in Ferguson as families protesting the killing of Michael Brown were plentiful on Aug. 15, 2014. Robert Cohen/AP Photo

Smoke from a tire burnout rises over protestors on West Florissant Avenue in Ferguson on Aug. 15, 2014. Robert Cohen/AP Photo

A woman voices her displeasure after the name of the officer involved in the shooting of Michael Brown was released in Ferguson, Missouri August 15, 2014. Lucas Jackson/Reuters

Police Chief Thomas Jackson leaves the parking lot of a gas station after announcing the name of the Ferguson police officer responsible for the August 9 shooting death of Michael Brown on August 15, 2014 in Ferguson, Missouri. Scott Olson/Getty Images

A man with a walking stick passes protest messages written in a parking lot before the announcement of the name of the officer involved in the shooting of Michael Brown in Ferguson, Missouri August 15, 2014. Lucas Jackson/Reuters

Demonstrators take part in a rally on West Florissant Avenue to protest the shooting death of an unarmed teen by a police officer in Ferguson, Mo., Aug. 15, 2014. Bilgin S. Sasmaz/Anadolu Agency/Getty Images

Capt. Ronald Johnson of the Missouri Highway Patrol hugs Angela Whitman, of Berkeley, Mo., on West Florissant Avenue in Ferguson, Mo., Aug. 14, 2014. The Missouri Highway Patrol took control of the St. Louis suburb, 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. David Carson/St. Louis Post-Dispatch/AP Photo

Demetrus Washington joins other demonstrators protesting the shooting death of teenager Michael Brown, Aug. 14, 2014 in Ferguson, Mo. Scott Olson/Getty Images

FERA police officer standing watch as demonstrators protest the shooting death of teenager Michael Brown conceals his/her identity, Aug. 13, 2014, in Ferguson, Mo. Scott Olson/Getty Images

An Al Jazeera television crew, covering demonstrators protesting the shooting death of teenager Michael Brown, scramble for cover as police fire tear gas into their reporting position on August 13, 2014 in Ferguson, Missouri. Scott Olson/Getty Images

A young woman walks from a corner after police standing near the corner fired tear gas at her, Aug. 13, 2014, in Ferguson, Missouri. Scott Olson/Getty Images

A protester takes shelter from smoke billowing around him, Aug. 13, 2014, in Ferguson, Mo. David Carson/St. Louis Post-Dispatch/AP Photo

A combination photograph shows in sequence a protester throwing back a smoke bomb while clashing with police in Ferguson, Missouri, Aug. 13, 2014. Police in Ferguson fired several rounds of tear gas to disperse protesters late on Wednesday, on the fourth night of demonstrations over the fatal shooting last weekend of an unarmed black teenager Michael Brown, 18, by a police officer on Saturday after what police said was a struggle with a gun in a police car. A witness in the case told local media that Brown had raised his arms to police to show that he was unarmed before being killed. Mario Anzuoni/Reuters

Police officers work their way north on West Florissant Avenue in Ferguson, Mo., clearing the road of people, Aug. 13, 2014. Robert Cohen/St. Louis Post-Dispatch/AP Photo

Jeremiah Parker, 4, stands in front of his mother, Shatara Parker, as they attend a protest, Aug. 13, 2014, in Ferguson, Mo. Jeff Roberson/AP Photo

Police walk through a cloud of smoke as they clash with protesters, Aug. 13, 2014, in Ferguson, Mo. Jeff Roberson/AP Photo

A device deployed by police goes off in the street as police and protesters clash, Aug. 13, 2014, in Ferguson, Mo. Jeff Roberson/AP Photo

Police stand watch as demonstrators protest the shooting death of teenager Michael Brown, Aug. 13, 2014, in Ferguson, Missouri. Scott Olson/Getty Images

Demonstrators pray while protesting the shooting death of teenager Michael Brown, in Ferguson, Missouri Aug. 13, 2014. Mario Anzuoni/Reuters

Demonstrators protest the shooting death of teenager Michael Brown, Aug. 13, 2014 in Ferguson, Missouri. Scott Olson/Getty Images

A demonstrator throws back a tear gas container after tactical officers worked to break up a group of bystanders on Chambers Road and West Florissant, Aug. 13, 2014, in St. Louis. Robert Cohen/St. Louis Post-Dispatch/AP Photo

Police force protesters from the business district into nearby neighborhoods, Aug. 11, 2014, in Ferguson, Mo. Scott Olson/Getty Images