4 of 25: This photo, which AP obtained from Don Andres and has been authenticated based on details in it, shows emergency personnel attending to a scene where a gunman was reported at the Washington Navy Yard in Washington, on Monday, Sept. 16, 2013. At least one gunman opened fire inside a building at the Washington Navy Yard on Monday morning, and a Defense Department official said several people were killed and as many as 10 were wounded, including a law enforcement officer. (AP Photo/Don Andres)

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