At least one gunman opened fire Monday inside the Washington Navy Yard, attacking office workers at a heavily guarded military facility in the heart of the nation's capital. At least 12 people were

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At least one gunman opened fire Monday inside the Washington Navy Yard, attacking office workers at a heavily guarded military facility in the heart of the nation's capital. At least 12 people were killed.

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WPVI – Philadelphia
Mon, Sep 16, 2013 3:10 PM EDT