Twelve people, including a police sergeant, were shot dead in a shooting at a nighttclub close to Los Angeles, police said Thursday.

All the victims were killed inside the bar in the suburb of Thousand Oaks late on Wednesday, including the officer who had been called to the scene, Sheriff Geoff Dean told reporters.

The gunman was also dead at the scene, Dean added. The bar was hosting a college country music night.

The venue was hosting an event for college students and possibly several hundred young people were inside, said Captain Garo Kuredjian of the Ventura County Sheriff's office.

He said around 0915 GMT that the shooter was still confined inside the premises, adding he did not know if the shooter had been subdued or shot. 

Police who responded to reports of a shooting rushed to the scene and engaged the gunman, said Kuredjian.

A deputy sheriff is among the 11 people shot.

The incident happened at the Borderline Bar and Grill in the town of Thousand Oaks, a quiet, upscale residential suburb of Los Angeles. 

The Los Angeles Times quoted a law enforcement official as saying at least 30 shots had been fired.

An unnamed witness told the newspaper that someone ran into the bar around 11:30 pm and started shooting what looked to be a black pistol.

"He shot a lot, at least 30 times. I could still hear gunshots after everyone left," the Times quoted the man as saying.

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