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

Police surround and detain two people in a car on August 13, 2014 in Ferguson, Missouri. (Photo by Scott Olson/Getty Images) ( 453582858 )

Terrell Williams El hugs his daughter Sharell, 9, while standing with his wife, Shamika Williams, and daughters Tamika, 6, and Sharell, 2, on Wednesday, Aug. 13, 2014, in Ferguson, Mo. (AP Photo/St. Louis Post-Dispatch, David Carson) ( APTOPIX Police Shooting Missouri )

A protester takes shelter from smoke billowing around him Wednesday, Aug. 13, 2014, in Freguson, Mo. (AP Photo/St. Louis Post-Dispatch, David Carson) ( APTOPIX Police Shooting Missouri )

A man watches as police walk through a cloud of smoke during a clash with protesters Wednesday, Aug. 13, 2014, in Ferguson, Mo. (AP Photo/Jeff Roberson) ( APTOPIX Police Shooting Missouri )

Police stand watch as demonstrators protest the shooting death of teenager Michael Brown on August 13, 2014 in Ferguson, Missouri. Brown was shot and killed by a Ferguson police officer on Saturday. Ferguson, a St. Louis suburb, is experiencing its fourth day of violent protests since the killing. (Photo by Scott Olson/Getty Images) ( 453583704 )

Demonstrators, protesting the shooting death of teenager Michael Brown, scramble for cover as police fire tear gas on August 13, 2014 in Ferguson, Missouri. Brown was shot and killed by a Ferguson police officer on Saturday. Ferguson, a St. Louis suburb, is experiencing its fourth day of violent protests since the killing. (Photo by Scott Olson/Getty Images) ( 453582452 )

Demonstrators, protesting the shooting death of teenager Michael Brown, flee as police shoot tear gas into the crowd of several hundred after someone reportedly threw a bottle at the line of police on August 13, 2014 in Ferguson, Missouri. Brown was shot and killed by a Ferguson police officer on Saturday. Ferguson, a St. Louis suburb, is experiencing its fourth day of violent protests since the killing. (Photo by Scott Olson/Getty Images) ( 453582474 )

Demonstrators, protesting the shooting death of teenager Michael Brown, flee as police shoot tear gas into the crowd of several hundred after someone reportedly threw a bottle at the line of police on August 13, 2014 in Ferguson, Missouri. Brown was shot and killed by a Ferguson police officer on Saturday. Ferguson, a St. Louis suburb, is experiencing its fourth day of violent protests since the killing. (Photo by Scott Olson/Getty Images) ( 453582480 )

A young woman walks from a corner after police standing near the corner fired tear gas at her on August 13, 2014 in Ferguson, Missouri. Ferguson is experiencing its fourth day of unrest after following the shooting death of teenager Michael Brown on Saturday. Brown, who was not armed was shot and killed by a Ferguson police officer. (Photo by Scott Olson/Getty Images) ( 453582860 )

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. Brown was shot and killed by a Ferguson police officer on Saturday. Ferguson, a St. Louis suburb, is experiencing its fourth day of violent protests since the killing. (Photo by Scott Olson/Getty Images) ( 453582874 )

A police officer patrols a business district on August 13, 2014 in Ferguson, Missouri. Ferguson is experiencing its fourth day of unrest after following the shooting death of teenager Michael Brown on Saturday. Brown was shot and killed by a Ferguson police officer. (Photo by Scott Olson/Getty Images) ( 453582870 )

Demonstrators protest the shooting death of teenager Michael Brown on August 13, 2014 in Ferguson, Missouri. Brown was shot and killed by a Ferguson police officer on Saturday. Ferguson, a St. Louis suburb, is experiencing its fourth day of violent protests since the killing. (Photo by Scott Olson/Getty Images) ( 453583588 )

Demonstrators protest the shooting death of teenager Michael Brown on August 13, 2014 in Ferguson, Missouri. Brown was shot and killed by a Ferguson police officer on Saturday. Ferguson, a St. Louis suburb, is experiencing its fourth day of violent protests since the killing. (Photo by Scott Olson/Getty Images) ( 453583590 )

Demonstrators protest the shooting death of teenager Michael Brown on August 13, 2014 in Ferguson, Missouri. Brown was shot and killed by a Ferguson police officer on Saturday. Ferguson, a St. Louis suburb, is experiencing its fourth day of violent protests since the killing. (Photo by Scott Olson/Getty Images) ( 453583608 )

A demonstrator, protesting the shooting death of teenager Michael Brown, scrambles for cover as police fire tear gas on August 13, 2014 in Ferguson, Missouri. Brown was shot and killed by a Ferguson police officer on Saturday. Ferguson, a St. Louis suburb, is experiencing its fourth day of violent protests since the killing. (Photo by Scott Olson/Getty Images) ( 453583142 )

Demonstrators protest the shooting death of teenager Michael Brown on August 13, 2014 in Ferguson, Missouri. Brown was shot and killed by a Ferguson police officer on Saturday. Ferguson, a St. Louis suburb, is experiencing its fourth day of violent protests since the killing. (Photo by Scott Olson/Getty Images) ( 453583610 )

An explosive device deployed by police flies in the air as police and protesters clash Wednesday, Aug. 13, 2014, in Ferguson, Mo. Protests in the St. Louis suburb rocked by racial unrest since a white police officer shot an unarmed black teenager to death turned violent Wednesday night, with people lobbing molotov cocktails at police who responded with smoke bombs and tear gas to disperse the crowd. (AP Photo/Jeff Roberson) ( Police Shooting Missouri )

Police stand watch as demonstrators protest the shooting death of teenager Michael Brown on August 13, 2014 in Ferguson, Missouri. Brown was shot and killed by a Ferguson police officer on Saturday. Ferguson, a St. Louis suburb, is experiencing its fourth day of violent protests since the killing. (Photo by Scott Olson/Getty Images) ( 453583688 )

Police stand watch as demonstrators protest the shooting death of teenager Michael Brown on August 13, 2014 in Ferguson, Missouri. Brown was shot and killed by a Ferguson police officer on Saturday. Ferguson, a St. Louis suburb, is experiencing its fourth day of violent protests since the killing. (Photo by Scott Olson/Getty Images) ( 453583700 )

Police stand watch as demonstrators protest the shooting death of teenager Michael Brown on August 13, 2014 in Ferguson, Missouri. Brown was shot and killed by a Ferguson police officer on Saturday. Ferguson, a St. Louis suburb, is experiencing its fourth day of violent protests since the killing. (Photo by Scott Olson/Getty Images) ( 453583706 )

A protester holds up a sign as a police helicopter circles overhead Wednesday, Aug. 13, 2014, in Ferguson, Mo. Protests in the St. Louis suburb rocked by racial unrest since a white police officer shot an unarmed black teenager to death turned violent Wednesday night, with some people lobbing Molotov cocktails and other objects at police who responded with smoke bombs and tear gas to disperse the crowd. (AP Photo/Jeff Roberson) ( Police Shooting Missouri )

Jeremiah Parker, 4, stands in front of his mother, Shatara Parker, as they attend a protest Wednesday, Aug. 13, 2014, in Ferguson, Mo. Nights of unrest have vied with calls for calm in a St. Louis suburb where Michael Brown, an unarmed black teenager was killed by police, while the community is still pressing for answers about the weekend shooting. (AP Photo/Jeff Roberson) ( APTOPIX Police Shooting Missouri )

A device deployed by police goes off in the street as police and protesters clash Wednesday, Aug. 13, 2014, in Ferguson, Mo. Authorities in the St. Louis suburb where an unarmed black teen was shot and killed by a police officer have used tear gas to try to disperse protesters after flaming projectiles were thrown from the crowd. (AP Photo/Jeff Roberson) ( Police Shooting Missouri )

A protester kicks a smoke grenade deployed by police back in the direction of police, Wednesday, Aug. 13, 2014, in Ferguson, Mo. Protests in the St. Louis suburb rocked by racial unrest since a white police officer shot an unarmed black teenager to death turned violent Wednesday night, with people lobbing Molotov cocktails at police who responded with smoke bombs and tear gas to disperse the crowd. (AP Photo/Jeff Roberson) ( APTOPIX Police Shooting Missouri )

Police advance through smoke Wednesday, Aug. 13, 2014, in Ferguson, Mo. Protests in the St. Louis suburb rocked by racial unrest since a white police officer shot an unarmed black teenager to death turned violent Wednesday night, with people lobbing molotov cocktails at police who responded with smoke bombs and tear gas to disperse the crowd. (AP Photo/Jeff Roberson) ( Police Shooting Missouri )

Buttons that state "Justice for Michael Brown" are piled together in a box in Ferguson, Mo., Wednesday, Aug. 13, 2014. Protests in the St. Louis suburb rocked by racial unrest since a white police officer shot an unarmed black teenager to death turned violent Wednesday night, with some people lobbing Molotov cocktails and other objects at police who responded with smoke bombs and tear gas to disperse the crowd. (AP Photo/St. Louis Post-Dispatch, David Carson) ( Police Shooting Missouri )

People protest as tear gas canisters detonate around them on Wednesday, Aug. 13, 2014, in Ferguson, Mo. Protests in the St. Louis suburb rocked by racial unrest since a white police officer shot an unarmed black teenager to death turned violent Wednesday night, with people lobbing molotov cocktails at police who responded with smoke bombs and tear gas to disperse the crowd. (AP Photo/St. Louis Post-Dispatch, Chris Lee) ( Police Shooting-Missouri )

Police officers work their way north on West Florissant Avenue in Ferguson, Mo., clearing the road with the use of tear gas and smoke bombs Wednesday, Aug. 13, 2014. Protests in the St. Louis suburb rocked by racial unrest since a white police officer shot an unarmed black teenager to death turned violent Wednesday night, with some people lobbing Molotov cocktails and other objects at police who responded with smoke bombs and tear gas to disperse the crowd. (AP Photo/St. Louis Post-Dispatch, Robert Cohen) ( Police Shooting Missouri )

A man tries to calm a group of protesters as police stand in the distance in Ferguson, Mo. on Wednesday, Aug. 13, 2014. On Saturday, Aug. 9, 2014, a white police officer fatally shot Michael Brown, an unarmed black teenager. (AP Photo/Jeff Roberson) ( Police Shooting Missouri )

ST. LOUIS, MO - AUGUST 12: A capacity crowd gathers at Greater St. Marks Family Church along with the family of Michael Brown and civil rights leader Rev. Al Sharpton to discuss the killing of Brown and the civil unrest resulting from his death on August 12, 2014 in St Louis, Missouri. Brown was shot and killed by a police officer on Saturday in the nearby suburb of Ferguson. Ferguson has experienced two days of violent protests since the killing but, tonight the town remained mostly peaceful. (Photo by Scott Olson/Getty Images) ( 453549584 )

ST. LOUIS, MO - AUGUST 12: A tear rolls down the cheek of Lesley McSpadden, the mother of slain teenager Michael Brown, during a community meeting held at Greater St. Marks Family Church to discuss the killing of her son and the civil unrest resulting from his death on August 12, 2014 in St Louis, Missouri. Brown was shot and killed by a police officer on Saturday in the nearby suburb of Ferguson. Ferguson has experienced two days of violent protests since the killing but, tonight the town remained mostly peaceful. (Photo by Scott Olson/Getty Images) ( 453549600 )

FERGUSON, MO - AUGUST 13: Demonstrators, protesting the shooting death of teenager Michael Brown, sit in the street during a peaceful protest on August 13, 2014 in Ferguson, Missouri. Brown was shot and killed by a Ferguson police officer on Saturday. Ferguson, a St. Louis suburb, has experienced three days of violent protests since the killing. (Photo by Scott Olson/Getty Images) ( 453575524 )

A march organized by area ministers makes its way down W. Florissant in Ferguson, Mo. on Wednesday, Aug. 13, 2014. On Saturday, Aug. 9, 2014, a white police officer fatally shot Michael Brown, an unarmed black teenager, in the St. Louis suburb. (AP Photo/St. Louis Post-Dispatch, J.B. Forbes) ( Police Shooting Missouri )

FERGUSON, MO - AUGUST 13: Demonstrators protest the shooting death of teenager Michael Brown on August 13, 2014 in Ferguson, Missouri. Brown was shot and killed by a Ferguson police officer on Saturday. Ferguson, a St. Louis suburb, has experienced three days of violent protests since the killing. (Photo by Scott Olson/Getty Images) ( 453575506 )

FERGUSON, MO - AUGUST 13: Police Chief Thomas Jackson fields questions related to the shooting death of teenager Michael Brown during a press conference on August 13, 2014 in Ferguson, Missouri. Brown was shot and killed by a Ferguson police officer on Saturday. Ferguson has experienced three days of violent protests since the killing. (Photo by Scott Olson/Getty Images) ( 453572012 )

FERGUSON, MO - AUGUST 12: Police take up position to control demonstrators who were protesting the killing of teenager Michael Brown on August 12, 2014 in Ferguson, Missouri. Brown was shot and killed by a police officer on Saturday in the St. Louis suburb of Ferguson. Ferguson has experienced two days of violent protests since the killing but, tonight's protest was peaceful. (Photo by Scott Olson/Getty Images) ( 453548886 )

Protesters sit in the middle of a street holding hands as Missouri state Sen. Maria Chappelle-Nadal at left, wears a button remembering Michael Brown, Wednesday, Aug. 13, 2014, in Ferguson, Mo. Nights of unrest have vied with calls for calm in a St. Louis suburb where Michael Brown, unarmed black teenager was killed by police, while the community is still pressing for answers about the weekend shooting. (AP Photo/Jeff Roberson) ( Police Shooting Missouri )

FERGUSON, MO - AUGUST 12: Demonstrators protest the killing of teenager Michael Brown on August 12, 2014 in Ferguson, Missouri. Brown was shot and killed by a police officer on Saturday in the St. Louis suburb of Ferguson. Ferguson has experienced two days of violent protests since the killing but, tonight's protest was peaceful. (Photo by Scott Olson/Getty Images) ( 453548900 )

A community activist tries to persuade a group of protesters to move back as police in riot gear watch protesters in Ferguson, Mo. on Wednesday, Aug. 13, 2014. On Saturday, Aug. 9, 2014, a white police officer fatally shot Michael Brown, an unarmed black teenager, in the St. Louis suburb. (AP Photo/Jeff Roberson) ( Police Shooting Missouri )

Police in riot gear watch protesters in Ferguson, Mo. on Wednesday, Aug. 13, 2014. On Saturday, Aug. 9, 2014, a white police officer fatally shot Michael Brown, an unarmed black teenager, in the St. Louis suburb. (AP Photo/Jeff Roberson) ( Police Shooting Missouri )

Protesters raise their hands in front of police atop an armored vehicle in Ferguson, Mo. on Wednesday, Aug. 13, 2014. On Saturday, Aug. 9, 2014, a police officer fatally shot Michael Brown, an unarmed black teenager, in the St. Louis suburb. (AP Photo/St. Louis Post-Dispatch, J.B. Forbes) ( APTOPIX Police Shooting Missouri )

FERGUSON, MO - AUGUST 12: Demonstrators protest the killing of teenager Michael Brown on August 12, 2014 in Ferguson, Missouri. Brown was shot and killed by a police officer on Saturday in the St. Louis suburb of Ferguson. Ferguson has experienced two days of violent protests since the killing but, tonight's protest was peaceful. (Photo by Scott Olson/Getty Images) ( 453548876 )

ST. LOUIS, MO - AUGUST 12: Demonstrators protest the killing of teenager Michael Brown outside Greater St. Marks Family Church while Browns family along with civil rights leader Rev. Al Sharpton and a capacity crowd of guests met inside to discuss the killing on August 12, 2014 in St Louis, Missouri. Brown was shot and killed by a police officer on Saturday in the nearby suburb of Ferguson. Ferguson has experienced two days of violent protests since the killing but, tonight the town remained mostly peaceful. (Photo by Scott Olson/Getty Images) ( 453549842 )

A man picks up a flaming bottle and prepares to throw it as a line of police advance in the distance Wednesday, Aug. 13, 2014, in Ferguson, Mo. Protests in the St. Louis suburb rocked by racial unrest since a white police officer shot an unarmed black teenager to death turned violent Wednesday night, with people lobbing molotov cocktails at police who responded with smoke bombs and tear gas to disperse the crowd. (AP Photo/Jeff Roberson) ( Police Shooting Missouri )

Police walk through a cloud of smoke as they clash with protesters Wednesday, Aug. 13, 2014, in Ferguson, Mo. Protests in the St. Louis suburb rocked by racial unrest since a white police officer shot an unarmed black teenager to death turned violent Wednesday night, with some people lobbing molotov cocktails at police who responded with smoke bombs and tear gas to disperse the crowd. (AP Photo/Jeff Roberson) ( APTOPIX Police Shooting Missouri )

Protesters try unsuccessfully to light a Molotov cocktail, Wednesday, Aug. 13, 2014, in Ferguson, Mo. Protests in the St. Louis suburb rocked by racial unrest since a white police officer shot an unarmed black teenager to death turned violent Wednesday night, with people lobbing molotov cocktails at police who responded with smoke bombs and tear gas to disperse the crowd. (AP Photo/St. Louis Post-Dispatch, Chris Lee) ( Police Shooting-Missouri )

A demonstrator throws back a tear gas container after tactical officers try to break up a group of bystanders Wednesday, Aug. 13, 2014 in West Florissant, Mo. Ferguson has been the site of nightly protests and unrest since 18-year-old Michael Brown was killed during a confrontation with an officer on Saturday. (AP Photo/St. Louis Post-Dispatch, Robert Cohen) ( APTOPIX Police Shooting Missouri )