Gunman kills at least 12 at Washington Navy Yard, gathering weapons along the way

A former petty officer who apparently had a grudge against the Navy sprayed an office building with bullets at the Washington Navy Yard on Monday, killing 12 people in a rampage that paralyzed part of the nation’s capital, authorities said.
Authorities said the gunman, a civilian contractor and former Navy reservist they identified as Aaron Alexis, 34, was killed after exchanging fire with officers who stormed the headquarters of the Naval Sea Systems Command in a massive law enforcement response.
D.C. Police Chief Cathy Lanier said Monday night that the suspect was believed to be the “single and sole” person responsible.

The gunman was armed with an assault-style rifle, a shotgun and a handgun when he was killed, authorities said. But law enforcement officials told NBC News they believed he arrived packing only the shotgun, which he bought last week from a gun dealer in Lorton, Va., about 20 miles from Washington.

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