Authorities later identified the gunman as Ian David Long, 28, a Marine veteran, who was found dead inside after apparently killing himself.
The gunman opened fire at the Borderline Bar & Grill in Thousand Oaks, about 40 miles west of Los Angeles, at about 11.20pm on Wednesday night.
At a news conference on Thursday, Sheriff Geoff Dean said police had responded to a minor disturbance call at Long's house in April.
"They called out our crisis intervention team, our mental health specialists who met with him, talked to him, and cleared him".
In that incident, deputies were called to his home, where Dean said Long was acting "irrationally".
It was the second mass shooting in America in less than two weeks.
They also were concerned that Long might be suffering from post-traumatic stress disorder, Dean said, "basing that (on) the fact that he was a veteran and had been in the Corps". "There is blood everywhere and the suspect is part of that".
"We do not know how many rounds were in the weapon", he said.
This time, gunfire claimed a Navy veteran who had lived through the deadliest mass shooting in modern USA history a year ago.
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Twelve people, including a police officer, have been killed after a gunman opened fire in a southern California bar.
"Great bravery shown by police", Trump tweeted. God bless all of the victims and families of the victims.
"I was confused because we didn't have any balloons at the time", she told CNN.
"Firefighting has been something I've been interested and wanted to do for a long time".
He said he and others smashed their way out of the bar onto a balcony and then jumped down to safety.
The Borderline bar is a popular spot for university students, and on Wednesday night was hosting College Country Night.
I have been fully briefed on the awful shooting in California. I hit the ground. He shot the security guard. The gunman was throwing smoke grenades all over the place. "I saw him point to the back at the cash register and he just kept firing".
Dean estimated that 10 to 15 people, including one with a gunshot wound, had gone to area hospitals. When they realized what was occurring, some patrons used barstools to break a window and escape, according to the Associated Press.
'All I did was grab as many people as I could and pull them underneath the table until I heard a break in the shots, and then we got people out of there, as much as we could, ' he added.
The shooter's identity, as well as the identities and ages of the victims, has yet to be confirmed.
But challenges are in store for some of the one-loss teams trying to stay alive in the chase for the College Football Playoff . The Longhorns' College Football Playoff hopes are long gone, but they still have a path to reach the Big 12 Championship game.
Whitaker, a former U.S. attorney for the Southern District of Iowa, had served as Sessions's chief-of-staff since September 2017. He is a longtime friend of Trump and endorsed him after dropping out of the 2016 presidential campaign.
The launch PS4 Pro would top out at 60 degrees Celsius, meanwhile the CUH-7200 revision tops out at 66 degrees Celsius. These are relatively minor tweaks which are less likely to influence anyone's decision to make the jump to a PS4 Pro.
"We recognize that we have not always gotten everything right in the past and we are sincerely sorry for that", he wrote. Protest organizers said Google publicly champions diversity and inclusion but doesn't do enough to put words into action.
Cape Town - Demi Lovato returned to social media on Tuesday with a photo showing that she had voted in the USA midterm elections. And while she may be eyeing a "hard" comeback next year, the Sober songstress won't be returning to the studio for several weeks.
In the post, Wade welcomed the baby girl born Wednesday night via surrogate using lyrics from Bill Withers' song " Lovely Day ". The NBA guard has three sons and the couple is also raising one of his nephews, according to The Associated Press.
A Romanian man believed to have been driving the vehicle has been charged with assisting unlawful entry to the UK. Andrut Mihai Duma, 29, is being held in custody until a hearing at Lewes Crown Court on November 26.
He reiterated that he was reviewing Interior Secretary Ryan Zinke job as well, following numerous reports of ethical violations. Bush when she was speaker a decade ago on taxes and other issues, and she welcomed the chance to do so again with Trump.
Every dollar invested in sanitation yields about $5.50 in global economic returns, according to the World Health Organization. The three-day event took place in China, where President Xi Jinping has made the "toilet revolution" a key priority.
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England's Jones favors two referees in rugby
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Walmart will offer Black Friday deals earlier this year
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