The gunman who injured 11 people inside a southern California bar is dead, Ventura County Sheriff's Office says.
A deputy who responded to the incident was shot and taken to a hospital while no other information on the other victims was immediately known.
Ventura County Sheriff's Office Captain Garo Kuredjian said the first reports of shots fired came around late on Wednesday at the Borderline Bar & Grill in Thousand Oaks, which is about 64km west of Los Angeles.
It was college night and country two-step lessons were being offered at the Borderline, according to its website. Police said hundreds were inside when the shooting occurred.
Tayler Whitler, 19, said she was inside the bar when the a man walked in with his face partly covered by something resembling a ski mask, opened fire on a person working on the door, then began to shoot people at random.
'It was really, really, really shocking,' she told KABC-TV as she stood with her father in the Borderline car park.
'It looked like he knew what he was doing.'
When the shots started, some people smashed windows with chairs to escape, other witnesses told CNN.
Nick Steinwender, student body president at nearby California Lutheran University, rushed to the scene when he heard about a shooting at the bar where he knew friends and fellow students were.
'It was chaos, people jumping out of windows, people hopping over gates to get out' Steinwender told KABC-TV.
Other witnesses and people posting on social media said the man might have fired up to 30 times.
Capt Kuredjian said shots were still being fired when the first officers arrived at the scene.
The Ventura County Star reported at least four ambulances were at the scene early Thursday to treat the victims.