WASHINGTON, D.C. -- A man with an assault rifle, shotgun and handgun opened fire Monday inside a building at the Washington Navy Yard.
Reports indicate at least 13 people were killed, including the shooter. The number of injured is unknown at this time.
NBC News reports that the shooter has been identified as Aaron Alexis, 34, of Fort Worth, Texas. Authorities say that he recently began working as a civilian contractor.
The Washington Police Chief said there could be as many as two other shooters at large on Monday afternoon. One of the men was located and is not considered a suspect or person of interest.
About 3,000 people work at the Naval Sea Systems Command Headquarters, which the navy says is its oldest shore establishment. It is home to the Chief of Naval Operations and is also headquarters for the Naval Historical Center and numerous naval commands.