D.C. Mayor: Still don't know motive for shooting
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D.C. Mayor: Still don't know motive for shooting

Washington, D.C. Police hold a news conference on the Navy Yard shooting. D.C. Mayor Vincent Gray and Chief of Police, Cathy Lanier, provide updates on the ongoing investigation. Police are still seeking a person of interest.
15:22
Mon, Sep 16 20134:18 PM EDT