Shooting at Navy Yard in Washington

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Police respond to the shooting at the Washington Navy Yard, Sept. 16, 2013.

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U.S. Capitol Police personnel keep watch on the East Plaza of the Capitol as the investigation continues to the shooting at the nearby Washington Navy Yard, Sept. 16, 2013.

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Police who responded to shooting at the Washington Navy Yard leave the facility, Sept. 16, 2013.

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A Metropolitan Police Department officer walks near the Washington Navy Yard, Sept. 16, 2013.