A gunman opened fire during college country night at Borderline Bar & Grill in Thousand Oaks, California on November 7, killing 12 innocent people, including a sheriff's deputy who was expected to retire in just months, officials confirmed.
"We don't know who shot anybody at this point".
He was dead when police arrived on the scene, Ventura County Sheriff Geoff Dean said.
Long was a Marine Corps veteran and was on active duty from August, 2008 to March, 2013.
"Obviously he had something going on in his head that would cause him to do something like this", Dean said.
Mental health specialists talked with Long and found that no special action was necessary. Don MacLeod said he did not call police but avoided speaking with Ian Long.
"My Son is home, well sort of, back in Hawaii, soon to be in Cali come January, hooray!" she wrote on December 14, 2012. The sheriff believes Dean took his own life.
Alaina Housley, 18 - one of the victims in the Thousand Oaks shooting.
"It's a horrific scene in there", Dean said in the parking lot.
"He was somewhat irate, acting a little irrationally", Dean said. "There is blood everywhere and the suspect is part of that, and I didn't want to get that close and disturb the scene and possibly disturb the investigation".
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At least one person was being treated for a gunshot wound, while more than a dozen others suffered minor injuries after jumping out of windows and diving under tables during the attack. Add Thousand Oaks Shooting as an interest to stay up to date on the latest Thousand Oaks Shooting news, video, and analysis from ABC News.
President Donald Trump, who has resisted a surge in calls for tougher gun controls since 17 students were shot dead at Stoneman Douglas High School in Florida earlier this year, said on Twitter that he had been "fully briefed on the awful shooting in California".
The dead included 11 people inside the bar and a veteran sheriff's sergeant who was the first officer through the door.
Trump ordered USA flags to be flown at half-staff at public buildings and grounds.
The venue was hosting a country music event for college students and its possible several hundred young people were inside.
Pepperdine University said some of its students were at the bar, and it's working to identify them.
"When (he) started to reload, that's when we got people out of there and I didn't look back", Wennerstrom said.
Witnesses said that people dropped to the floor and hid behind bar stools in stunned silence.
Thousand Oaks mayor Andy Fox reminded that his city is "consistently ranked one of the highest with respect to the lowest crime rate per capita, we're proud of that".
"I've learned it doesn't matter what community you're in", Dean told reporters when asked if he was surprised this happened in Thousand Oaks.