13 killed in Washington Navy Yard shooting rampage

September 17, 2013 - 10:35 AM
Navy Yard Shooting

This booking photo provided by the Fort Worth Police Department shows Aaron Alexis, arrested in September, 2010, on suspicion of discharging a firearm in the city limits. The FBI has identified Alexis, 34, as the gunman in the Monday, Sept. 16, 2013 shooting rampage at at the Washington Navy Yard in Washington that left thirteen dead, including himself. (AP Photo/ Fort Worth Police Department)

WASHINGTON (AP) — The deadly attack at the Washington Navy Yard was carried out by one of the military's own: a defense contract employee and former Navy reservist who used a valid pass to get onto the installation and started firing inside a building, killing 12 people before he was slain in a gun battle with police.

The shooting was the deadliest on a military installation in the U.S. since the tragedy at Fort Hood, Texas, in 2009.

Law enforcement officials say gunman Aaron Alexis carried three weapons at the Navy Yard: an AR-15 assault rifle, a shotgun and a handgun he took from an officer at the scene.

Investigators say his motive is a mystery.