Ventura County Sheriff Geoff Dean says the suspected gunman died at the scene from what they believe is a self-inflicted wound.
Officials said that shots were still being fired when the first officers arrived at the scene. "There was an exit right next to me, so I went through that".
"(He) said to her, "Hey I got to go handle a call.
Chandler Gunn, 23, told the San Diego Tribune that when he heard about the shooting he rushed to the bar and called a friend who works at Borderline, who like numerous bar's regular patrons was also at the Route 91 Harvest music festival in Las Vegas when a gunman killed 58 people and wounded hundreds. However, Wednesday's tragedy is the 308th mass shooting - defined as a shooting in which three people or more are injured or killed, by gunfire or while escaping - so far this year.
"It's been a rough night for all of us", Buschow said, according to the report.
"It was chaos, people jumping out of windows, hopping over gates and just trying to get out", he said.
Friends are remembering a U.S. sheriff's sergeant who was killed trying to stop a shooting rampage at a California bar as a "cop's cop" who didn't hesitate to run toward danger. "That's the stuff I'm truly going to miss", he said. Nearby colleges include California Lutheran University, California State University Channel Islands, Pepperdine University and Moorpark College.
Taylor Von Molt, 21, told CNN that the shooter was wearing what looked like a bandana and a hoodie and was a burly man.
It was the latest chapter in America's epidemic of gun violence.
This undated photo provided by the Ventura County Sheriff's Department shows Sheriff's Sgt Ron Helus, who was killed in the shooting. People dropped to the floor and hid behind bar stools in stunned silence.
Police said Long appeared to have shot randomly into the crowd at the Borderline Bar and Grill in Thousand Oaks, about 50km west of Los Angeles.
The Associated Press is reporting the gunman was 29-years-old and armed with a.45-calibre handgun.
Thousand Oaks is about 40 miles northwest of Los Angeles and It's considered one of the safest large cities in the country, according to Federal Bureau of Investigation crime statistics, USA Today reported.
"It was just young people having a great time and this maniac came in and started shooting people for no reason at all".
ORIGINAL 5:44 a.m.
"We can't confirm the shooter is in custody at this point", Ventura County Sheriff's Office Capt. Garo Kuredjian said at a news conference.
The bar has a college night on Wednesdays for ages 18 and up, according to its website.