WASHINGTON, DC -- 9/16/13 -- DC Mayor Vincent Gray (left) stands by as DC Police Chief Cathy Lanier addresses the media during a press briefing. U.S. Park Police Chief Teresa Chambers (far left), stands by as a helicopter patrols the area... Several people killed and at least 10 wounded by multiple gunmen in a shooting at the Washington Navy Yard.…by André Chung #AC1_3602
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