We are still looking for the shooter.
Captain Garo Kuredjian of the Ventura county sheriff's office said the extent of their injuries was unknown.
At least eleven, including a sherrif's deputy, were injured, ABC reported. Kuredjian said he could not confirm whether any of those shot were dead or the severity of their injuries.
Multiple people were seen being led out of the bar by deputies.
"I do hope to give updates about the six and the status of the shooter".
Dozens of police cars and emergency service vehicles were spotted at the scene in Thousand Oaks around 11.20pm local time on Wednesday.
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Emma said they would be "celebrating for the women who were around when we came out.it's going to be very special". Emma said: "There's no plans for Glastonbury but we should though".
The number of potential victims is unclear, but a witness told ABC Los Angeles station KABC-TV that he saw a security guard get shot, and that the alleged shooter appeared to use "a big handgun" and smoke grenades.
Borderline Bar & Grill is a western-style facility that hosts theme nights such as country, salsa and swing dancing.
The bar was hosting a college country music night on Wednesday, according to its website.
Witnesses said many of those inside were college students. "From what I heard, the gunman started shooting at the front desk".
No other information was immediately available.
It has been "quite some time" since there was a shooting of any kind in Thousand Oaks, a city of about 130,000 people about 40 miles (64 kilometers) west of Los Angeles, just across the county line.