Washington Navy Yard shooting

Flowers, flags and a child's drawing are pictured at a makeshift memorial outside the Navy Yard after a gunman killed 12 people, in Washington

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A civilian who disarmed a guard and fatally shot a sailor on a docked destroyer before being killed himself entered the base on a tractor-trailer with a transportation worker's credential, according to the Navy and a military official.

Navy officials were still searching for answers Wednesday about what might have motivated the civilian, who has not been identified. The civilian was shot and killed late Monday night by Navy security forces — a sailor assigned to the USS Mahan, said the military official, who spoke on condition of anonymity because the person was not authorized to publicly release the information about the civilian or the victim. (AP)

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