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WASHINGTON (AP) - Officials say at least one shooter has died at the Washington Navy Yard, where several people were killed and as many as 10 were wounded.

A federal law enforcement official and a Defense Department official said Monday morning that a shooter has died. Both spoke on condition of anonymity because they were not authorized to discuss the ongoing investigation.

Two other officials have said they are looking into the possibility of a second shooter at the Navy Yard.

Earlier in the day, the U.S. Navy said it was searching for an active shooter at the Naval Sea Systems Command headquarters, where about 3,000 people work.

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