At least six people, including one officer, were injured in the shooting the Borderline Bar and Grill at about 23:20 local time on Wednesday.
Police in the USA are responding to reports of a shooting at a bar in Thousand Oaks, California.
A gunman has opened fire at a country music bar in the city of Thousand Oaks, California, injuring multiple people.
Ventura County Sheriff's Office Capt. Garo Kuredjian said at a news conference early Thursday that a sheriff's deputy was also shot and taken to a hospital.
Police responded to the incident at around 11.30pm local time (7.30am GMT).
Around 30 shots were fired, officers at the scene claim.
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Witnesses said a man fired several shots from a handgun before tossing smoke bombs into the crowded bar. "These poeple have never hurt anyone in their lives, they are just kids", he said.
Police and emergency crews flooded the scene. Information on the extent of the victims' injuries has not yet been released.
"We had to get out of there, and I apologise for leaving", the visibly distressed man said.
Reports say the suspect may have used smoke grenades as well as a gun in the attack.
It was college night and country two-step lessons were being offered Wednesday at the Borderline, according to its website.