Terrified patrons scrambled for the exits after the gunman started shooting a pistol in the Borderline Bar and Grill around 11:20 pm on Wednesday before killing himself, they said. The Western-style bar hosts theme nights such as country, salsa and swing dancing.
Update: Marine veteran Ian David Long, 28, was identified as the shooter who killed twelve people at a Thousand Oaks bar popular with college students. They found 12 people dead inside, including the gunman, who was discovered in an office, the sheriff said.
Deputies are at Long's home, seeking to serve a search warrant, Dean said.
Authorities are investigating reports that the gunman used a smoke bomb but said they had not found anything to support this.
But the weapon had an extended magazine, meaning it can carry more ammunition, which is illegal in California.
"I told my wife, 'Just be polite to him".
There have been almost as many mass shootings in the United States in 2018 as there have been days in the year so far, according to a nonprofit organization that records gun violence data.
It also marks the deadliest mass shooting in the country since 17 people were killed earlier this year at a high school in Parkland, Florida.
The bar is also close to several other universities, including California State University Channel Islands in Camarillo, Pepperdine in Malibu and Moorpark College in Moorpark.
'It's the second time in about a year and a month that this has happened, ' Nick Champion told OnSceneTV.
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"Borderline was our safe space", Brendan Kelly, who survived both attacks, told ABC News.
He said he and others smashed their way out of the bar onto a balcony and then jumped down to safety.
The Gun Violence Archive says more than 12,400 lives in America have been lost in 2018 as the result of gun violence. He was on the phone with his wife when he was dispatched to the Borderline Bar & Grill, Sheriff Geoff Dean told reporters. "Well, I don't want to say he was dead, but he was shot".
Federal Bureau of Investigation and local officers at the scene, following the shooting which left 13 people dead. "It could have been much, much worse", he said. "He would go to the ends of the Earth to find a suspect".
A next-door neighbour said he called authorities about six months ago when he heard loud banging and shouting at Long's home. The deputies called in mental health specialists. Court records show he married in 2009 and was divorced in 2013.
President Donald Trump praised police for their "great bravery" in the attack and ordered flags flown at half-staff in honor of the victims. He described an incident - which seems to match the April episode mentioned by the sheriff - in which he called law enforcement to Long's house because it "sounded like he was tearing down the walls of the house, like somebody's just beating on the walls with a big hammer or something".
Mourners outside a reception centre for families of victims.
U.S. Representative Jerry Nadler is the top Democrat on the House Judiciary Committee. One came after he was involved in a traffic collision. For many it provided a sense of community.
Thousand Oaks is a wealthy area about 60 kilometers northwest of Los Angeles. Thousand Oaks was considered the third-safest city in the USA this year, according to Niche, an online company that provides data on neighborhoods, companies and schools. "I would open the garage and would be like, 'What are you doing?'"