In this Aug. 17, 2014, file photo, police wait to advance after tear gas was used to disperse a crowd during a protest for Michael Brown, who was killed by a police officer in Ferguson, Mo. (AP Photo/Charlie Riedel, File)
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In this Aug. 17, 2014, file photo, police wait to advance after tear gas was used to disperse a crowd during a protest for Michael Brown, who was killed by a police officer in Ferguson, Mo. (AP Photo/Charlie Riedel, File)
