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

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

A young protester marches in downtown, Aug. 10, 2015, St. Louis.

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.

Officers and protesters face off along West Florissant Avenue, Aug. 10, 2015, in Ferguson, Mo.

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.

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

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.

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.

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.

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.

Demonstrators participate in a protest march on West Florissant Avenue, Aug. 9, 2015, in Ferguson, Mo.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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

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.

Police attempt to control demonstrators protesting, Aug. 18, 2014, in Ferguson, Mo.

A demonstrator reacts during a protest on West Florissant Avenue in Ferguson, Mo., Aug. 18, 2014.

Demonstrators gesture during a protest on West Florissant Avenue in Ferguson, Mo., Aug. 18, 2014.

Law enforcement officers watch on during a protest on West Florissant Avenue in Ferguson, Mo., Aug. 18, 2014.

Tear gas is deployed after police were fired upon, Aug. 18, 2014, in Ferguson, Mo.

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.

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.

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

Police advance on demonstrators protesting the killing of teenager Michael Brown, Aug. 17, 2014 in Ferguson, Mo.

Police wait to advance after tear gas was used to disperse a crowd, Aug. 17, 2014, during a protest.

A protestor runs down the street to escape tear gas fired at demonstrators, Aug. 17, 2014, in Ferguson, Mo.

Tactical trucks move down the street through tear gas in Ferguson, Mo., Aug. 17, 2014.

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

Police wait to advance after tear gas was used to dispersed a crowd, Aug. 17, 2014, during a protest.

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

Police wait to advance after tear gas was used to disperse a crowd, Aug. 17, 2014, during a protest.

Protesters run when the police shoot tear gas in Ferguson, Mo., Aug. 17, 2014.

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.

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.

Police stand guard before the mandatory midnight curfew on August 16, 2014 in Ferguson, Mo.

Demonstrators protest on Aug. 16, 2014, at the site where Michael Brown was killed on Canfield Dr. in Ferguson, Mo.

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.

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.

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

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

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

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.

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.

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.

Smoke from a tire burnout rises over protestors on West Florissant Avenue in Ferguson on Aug. 15, 2014.

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.

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.

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.

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.

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.

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

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.

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.

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

A protester takes shelter from smoke billowing around him, Aug. 13, 2014, in Ferguson, Mo.

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.

Police officers work their way north on West Florissant Avenue in Ferguson, Mo., clearing the road of people, Aug. 13, 2014.

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

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

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

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

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

Demonstrators protest the shooting death of teenager Michael Brown, Aug. 13, 2014 in Ferguson, Missouri.

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.

Police force protesters from the business district into nearby neighborhoods, Aug. 11, 2014, in Ferguson, Mo.

Tear gas hangs in the air as police force protesters from the business district into nearby neighborhoods, Aug. 11, 2014, in Ferguson, Mo.