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September 16, 2013 AT 11:15 AM
A man brandishing an assault rifle, shotgun and handgun opened fire inside a building at the Washington Navy Yard. The city police chief said 12 people were killed. SWAT officers swarmed the building, the headquarters of the Naval Sea Systems Command, and a shooter there was killed, sources told NBC News. Law enforcement officials identified the gunman to NBC News as Aaron Alexis, 34, originally of Fort Worth, Texas. They said he recently began working as a civilian contractor.