13 killed in California bar shooting

At least 13 people, including a police officer, were killed after a person opened fire, reportedly with a semi-automatic, gun at a bar in the US state of California.

The shooting took place in the city of Thousand Oaks whose sherif confirmed that 13 people had died. The gunman was among those killed.

A police officer who was part of the team that responded to the shooter was also killed, news agency Associated Press quoted the sheriff as saying.

News channel ABC News spoke to witnesses who said that the shooter first fired several shots from a handgun before tossing smoke bombs and then opening fire again.

Another witness said that the gunman fired 30 shots. "He shot a lot, at least 30 times. I could still hear gunshots after everyone left," said an unnamed witness.

A local news website, Ventura Country Star, reported that the shooting took place at a pub called Borderline Bar & Grill in the Californian city of Thousand Oaks.

A reporter for Ventura Country Star -- who seemed to be on the ground near the site of the shooting -- tweeted images showing personnel from the Federal Bureau of Investigation, the US's premier domestic security agency, at the scene of the shooting.

The shooting at the Borderline Bar & Bar followed a script that has been seen in several similar incidents previously.

The United States of America has witnessed multiple incidents of ,ass shootings some at bars and some at schools many of which have caused dozens of deaths.