The scene nearby the shooting. Photo: Screenshot.

NBC News – A man brandishing an assault rifle, shotgun and handgun opened fire Monday inside a building at the Washington Navy Yard — killing at least four people and wounding at least seven more, including two police officers, authorities said.

SWAT officers swarmed the building, the headquarters of the Naval Sea Systems Command, and a shooter there was killed, sources told NBC News. More than two hours after the first gunfire, there were reports that tactical teams were entering a second building at the Navy Yard, but there was no hard evidence of a second gunman.

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