THOUSAND OAKS (AP) — Terrified patrons hurled barstools through windows to escape or threw their bodies protectively on top of friends as a Marine combat veteran killed 12 people at a country music bar in an attack that added Thousand Oaks to the tragic roster of American cities traumatized by mass shootings.

Dressed all in black with his hood pulled up, the gunman apparently took his own life as scores of police converged on the Borderline Bar & Grill in Southern California.

The motive for the rampage late Wednesday night was under investigation.

The killer , Ian David Long, 28, was a former machine gunner and Afghanistan war veteran who was interviewed by police at his home last spring after an episode of agitated behavior that authorities were told might be post-traumatic stress disorder.

Opening fire with a handgun with an illegal, extra-capacity magazine, Long shot a security guard outside the bar and then went in and took aim at employees and patrons, authorities said. He also used a smoke bomb, according to a law enforcement official who was not authorized to discuss the investigation publicly and spoke on condition of anonymity.

The dead included a veteran sheriff's deputy who rushed in to confront the gunman, as well as a 22-year-old man who planned to join the Army, a freshman at nearby Pepperdine University and a recent Cal Lutheran graduate.

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