Workers emerge from a building after a deadly shooting at the Washington Navy Yard on Monday. There are multiple injuries and deaths, and one gunman is dead. Police say they are searching for two other "potential" shooters.
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A police helicopter flies overhead as officers walk on the roof of a building.
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A Park Police helicopter removes a man from the scene of the shooting.
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Workers emerge from a building after a deadly shooting at the Navy Yard. Alexis's motive is still uncertain but, D.C. Mayor Vincent Gray said in a press conference that there is "no reason to suspect terrorism."
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A military guard stands at the scene of the shooting. Shots were fired at around 8:20 a.m. ET.
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Washington, D.C., Police Chief Cathy Lanier and Mayor Vincent Gray speak to the media.
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President Obama said the federal government will do all it can to ensure that "whoever carried out this cowardly act is held responsible."
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Office workers, who had been under lock down since the shootings this morning, leave the area around the Washington Navy Yard on Monday in Washington, D.C. Thirteen people were killed, including the suspected gunman, and several were wounded.
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Brittany Carter, of Bowie, MD., (left) Jibri Johnson, of Landon, MD., (center) and Bryan Beard of Washington D.C. hold candles in remembrance of the 12 victims killed in a shooting at the Washington Navy Yard earlier in the day.
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This undated cell phone photo provided shows a smiling Aaron Alexis in Fort Worth, Texas.