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Jamahl Spence, right, pleads his case with a Normandy police officer in front of the Ferguson, Mo. police station on Sunday, Aug. 10, 2014, one day after a Ferguson officer shot and killed Michael Brown. (AP Photo/St. Louis Post-Dispatch, Robert Cohen) ( Police Shooting-Missouri )

Protestors confront police during an impromptu rally, Sunday, Aug. 10, 2014 to protest the shooting of Michael Brown, 18, by police in Ferguson, Mo. Saturday, Aug. 9, 2014. Brown died following a confrontation with police, according to St. Louis County Police Chief Jon Belmar, who spoke at a news conference Sunday. (AP Photo/Sid Hastings) ( APTOPIX Police Shooting-Missouri )

Piaget Crenshaw adds a message to items left at a spontaneous memorial for shooting victim Michael Brown, 18, Sunday, Aug. 10, 2014 at the scene of the shooting in Ferguson, Mo. Brown died following a confrontation with police, according to St. Louis County Police Chief Jon Belmar, who spoke at a news conference Sunday. Crenshaw, who lives in the apartment complex where Brown was shot, said she was a witness. (AP Photo/Sid Hastings) ( Police Shooting-Missouri )

Protestors blocking Florissant Road block a motorist who tries to get through their sit-in in front of the Ferguson, Mo., police department on Sunday, Aug. 10, 2014, one day after a Ferguson officer shot and killed Michael Brown. (AP Photo/St. Louis Post-Dispatch, Robert Cohen) ( Police Shooting-Missouri )

Activist Anthony Shahid tells the crowd to put their hands up on Sunday morning, Aug. 10, 2014, in Ferguson, Mo., as part of the protest against the police shooting of Michael Brown on Saturday. (AP Photo/St. Louis Post-Dispatch, J.B. Forbes) ( Police Shooting-Missouri )

A prayer vigil was held in front of the Ferguson, Mo. police department on Sunday, Aug. 10, 2014, one day after a Ferguson officer shot and killed Michael Brown. From left are Martha Hightower, Leah Clyburn and Marie Wilson. "I'm just tired of (the police) getting away with killing our youths," said Hightower. (AP Photo/St. Louis Post-Dispatch, Robert Cohen) ( Police Shooting-Missouri )

Protestors blocking Florissant Road raise their hands after being approached by police officers who asked them to stop blocking the street in front of the Ferguson police department on Sunday, Aug. 10, 2014, one day after a Ferguson officer shot and killed Michael Brown. Officers backed down and instead barricaded the street in both directions. (AP Photo/St. Louis Post-Dispatch, Robert Cohen) ( APTOPIX Police Shooting-Missouri )

Mourners embrace at a spontaneous memorial for shooting victim Michael Brown, 18, Sunday, Aug. 10, 2014 at the scene of the shooting in Ferguson, Mo. Brown, who was killed in a confrontation with police in the St. Louis suburb, was shot Saturday, Aug. 9, 2014. Brown died following a confrontation with police, according to St. Louis County Police Chief Jon Belmar, who spoke at a news conference Sunday. (AP Photo/Sid Hastings) ( Police Shooting-Missouri )

St. Louis County Police Chief Jon Belmar, left, delivers remarks as Ferguson Police Chief Thomas Jackson listens during a news conference, Sunday, Aug. 10, 2014 in Ferguson, Mo., where the men addressed issues surrounding the shooting of Michael Brown, 18, by Ferguson police Saturday, Aug. 9, 2014. Brown died following the confrontation with police, according to Belmar. (AP Photo/Sid Hastings) ( Police Shooting-Missouri )

St. Louis County Police Chief Jon Belmar, left, delivers remarks as Ferguson Police Chief Thomas Jackson listens during a news conference Sunday, Aug. 10, 2014 in Ferguson, Mo., where the men addressed issues surrounding the shooting of Michael Brown, 18, by Ferguson police Saturday, Aug. 9, 2014. Brown died following a confrontation with police, according to Belmar. (AP Photo/Sid Hastings) ( Police Shooting-Missouri )

Meghan O'Donnell, 29, from St. Louis, prays at the spot where Michael Brown was killed Sunday evening, Aug. 10, 2014, in Ferguson, Mo. A few thousand people have crammed the street where a black man was shot multiple times by a suburban St. Louis police officer. The candlelight vigil Sunday night was for 18-year-old Michael Brown, who died a day earlier. Police say he was unarmed. (AP Photo/St. Louis Post-Dispatch, J.B. Forbes) ( Police Shooting-Missouri )

Tammy Miles, left, and Janice Battle hold hands as they take a closer look at the scene where Michael Brown, 18, was shot in Ferguson, Mo., Sunday, Aug. 10, 2014. Brown died following a confrontation with police, according to St. Louis County Police Chief Jon Belmar, who spoke at a news conference Sunday. (AP Photo/Sid Hastings) ( Police Shooting-Missouri )

Protestors raise their hands during an impromptu rally, Sunday, Aug. 10, 2014 to protest the shooting of Michael Brown, 18, by police in Ferguson, Mo. Saturday, Aug. 9, 2014. Brown died following a confrontation with police, according to St. Louis County Police Chief Jon Belmar, who spoke at a news conference Sunday. (AP Photo/Sid Hastings) ( Police Shooting-Missouri )

Protesters bang on the side of a police car Sunday evening, Aug. 10, 2014, in Ferguson, Mo. A few thousand people have crammed the street where a black man was shot multiple times by a suburban St. Louis police officer. The candlelight vigil Sunday night was for 18-year-old Michael Brown, who died a day earlier. Police say he was unarmed. (AP Photo/St. Louis Post-Dispatch, J.B. Forbes) ( Police Shooting-Missouri )

A large crowd gathers at the candlelight vigil, Sunday evening, Aug. 10, 2014, in Ferguson, Mo. A few thousand people have crammed the street where a black man was shot multiple times by a suburban St. Louis police officer. The candlelight vigil Sunday night was for 18-year-old Michael Brown, who died a day earlier. Police say he was unarmed. (AP Photo/St. Louis Post-Dispatch, J.B. Forbes) ( Police Shooting-Missouri )

Protestors rally Sunday, Aug. 10, 2014 to protest the shooting of Michael Brown, 18, by police in Ferguson, Mo. Saturday, Aug. 9, 2014. Brown died following a confrontation with police, according to St. Louis County Police Chief Jon Belmar, who spoke at a press conference Sunday. The protesters rallied in front of the police and fire departments in Ferguson following Belmar's press conference. (AP Photo/Sid Hastings) ( Police Shooting-Missouri )

Protestors confront police during an impromptu rally, Sunday, Aug. 10, 2014 to protest the shooting of Michael Brown, 18, by police in Ferguson, Mo. on Saturday. Brown died following a confrontation with police, according to St. Louis County Police Chief Jon Belmar, who spoke at a news conference Sunday. The protesters rallied in front of the police and fire departments in Ferguson following Belmar's news conference. (AP Photo/Sid Hastings) ( Police Shooting-Missouri )

Amiah Murry, left, and Sabrina Webb add items to a spontaneous memorial for shooting victim Michael Brown, 18, Sunday, Aug. 10, 2014 at the scene of the shooting in Ferguson, Mo. Brown died following a confrontation with police, according to St. Louis County Police Chief Jon Belmar, who spoke at a press conference Sunday. (AP Photo/Sid Hastings) ( Police Shooting-Missouri )