FILE - In this Nov. 17, 2011, file photo, Dallas Police Chief David Brown speaks during a news conference at police headquarters in Dallas. Dallas police say one or more suspects opened fire on police headquarters early Saturday morning, June 13, 2015, rammed a police car and fled to a fast food restaurant just off interstate 45 outside the city where they are engaged in a standoff with police. Police Chief Brown tells a news confrerence that preliminary witness statements suggest there may have been other assailants firing from elevated locations. (AP Photo/LM Otero, File)
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