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FILE - From left, Martha Hightower, Leah Clyburn and Marie Wilson attend a prayer vigil in front of the Ferguson, Mo. police department on Sunday, Aug. 10, 2014, one day after a Ferguson officer shot and killed Michael Brown. (Robert Cohen/St. Louis Post-Dispatch via AP)
FILE - Protesters appeal to motorists for support while rallying on Monday, Aug. 11, 2014 in front of the QT gas station in Ferguson, Mo. that was looted and burned during rioting overnight that followed a candlelight vigil honoring 18-year-old Michael Brown, who was shot Aug. 9, 2014 by Ferguson police officers. (AP Photo/Sid Hastings, File)
FILE - Marcelle Stewart, left, confronts police officers during a march and rally in downtown Ferguson, Mo., Monday, Aug. 11, 2014. (AP Photo/Sid Hastings, File)