Updated at 4:41 a.m. ET
Police and rescuers are responding a shooting at a bar in the Ventura County, Calif., city of Thousand Oaks.
At least 11 people were shot, including one sheriff's deputy, Capt. Garo Kuredjian of the Ventura County Sheriff's Office told reporters at the scene. He said there were likely "hundreds" of people inside at the time.
Police believed the shooter was "confined" to inside the of the bar and was not a threat to the public, Kuredjian said around 1:30 a.m. local time.
He said sheriff's deputies were "still hearing shots" when they arrived on scene late Wednesday.
The incident occurred at the Borderline Bar & Grill, according to the Ventura County Star.
"The initial report indicated that a man had opened fire with a semi-automatic gun at about 11:20 p.m.," the paper reports, adding that "Officers on the scene indicated that approximately 30 shots had been fired and that victims would be at multiple locations as they fled."
A witness at the scene told NPR's Kirk Siegler she saw a smoke bomb go off.
One witness told ABC 7 that he saw a suspect throw smoke bombs into the front of the restaurant and shoot a security guard.
"I was at the front door and I was talking to my stepdad. I just started hearing these big pops," John Hedge told the station. "Pop, pop, pop. There was probably three or four, I hit the ground. I look up — the security guard is dead. Well, I don't want to say he was dead, but he was shot. He was down. The gunman was throwing smoke grenades all over the place. I saw him point to the back of the cash register … and he just kept firing. I ran out the front door."
Aerial footage from local news media shows a massive police response to the scene.
Borderline Bar & Grill's Facebook page lists country music events and shows video of large groups of people line dancing.
Wednesday nights at the bar are college nights that tend to attract students from Pepperdine University in Malibu, according to ABC 7. California Lutheran University and California State University, Channel Islands are located a short drive away as well.
Multiple ambulances were dispatched, the Fire Department said, with the Ventura County Star reporting that multiple victims were being treated at the scene.
This is a breaking news story. As often happens in situations like these, some information reported early may turn out to be inaccurate. We'll move quickly to correct the record and we'll only point to the best information we have at the time.