WASHINGTON — An employee at a defense contractor used his pass to get into the Washington Navy Yard and went on a deadly shooting rampage Monday, spraying bullets in the hallways and firing from a balcony on workers in an atrium below. Thirteen people were killed, including the gunman.
The motive for the attack — the deadliest mass shooting on a military installation in the U.S. since the tragedy at Fort Hood in 2009 — was a mystery, investigators said.
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