(CNN)The gunman who killed 12 people at the Borderline Bar & Grill in Thousand Oaks, California, was a 28-year-old veteran of the US Marine Corps who had previous run-ins with the law, officials said.
Here’s what we know about Ian David Long so far:The gunman is believed to have killed himselfThe shooter is dead, and his body was found inside the bar when police were able to enter the building, Ventura County Sheriff Geoff Dean said.Dean said he believed that the gunman killed himself.Read MoreThe gunman used one handgunDean said that officials found a Glock .45-caliber handgun at the scene that was purchased legally. The weapon usually holds 10 rounds, plus one in the chamber, but the gunman used an extended magazine in this shooting, Dean said.Dean said he did not know of the shooter’s motive, and he did not know of any connection between Long and the Borderline bar.The gunman had previous run-ins with the lawPolice had several contacts with Long previously.In April, officers responded to a disturbance at Long’s home, and he was somewhat irate and acting irrationally, Dean said. A mental health specialist met with him and ultimately decided not to detain him under laws pertaining to his mental health.Dean said that a crisis team that visited Long felt the military veteran might be suffering from post-traumatic stress disorder. Photos: In photos: Mass shooting at California barMolly Esterline is hugged by David Crawford on the scene of a shooting at a bar in Thousand Oaks, California, on Thursday, November 8.Hide Caption 1 of 24 Photos: In photos: Mass shooting at California barPeople stand in a parking lot along South Moorpark Road in Thousand Oaks in the aftermath of the shooting.Hide Caption 2 of 24 Photos: In photos: Mass shooting at California barInvestigators huddle at the command post near the bar.Hide Caption 3 of 24 Photos: In photos: Mass shooting at California barNellie Wong cries as Chyann Worrell holds her and Erika Sigman, right, stands beside them. All three were inside the Borderline Bar and Grill when shooting started.Hide Caption 4 of 24 Photos: In photos: Mass shooting at California barPolice work outside the venue where the shooting occurred.Hide Caption 5 of 24 Photos: In photos: Mass shooting at California barTim Dominguez, who was in the bar with his son, sits distraught under a freeway overpass near the crime scene in Thousand Oaks.Hide Caption 6 of 24 Photos: In photos: Mass shooting at California barHolden Harrah, 21, right, hugs family and friends after witnessing the shooting.Hide Caption 7 of 24 Photos: In photos: Mass shooting at California barA forensics team collects evidence at the scene.Hide Caption 8 of 24 Photos: In photos: Mass shooting at California barAn American Red Cross Disaster Relief vehicle is seen outside the Thousands Oaks Teen Center where people have come for family assistance following the bar shooting.Hide Caption 9 of 24 Photos: In photos: Mass shooting at California bar Law enforcement officers guard the road leading to the Borderline Bar and Grill.Hide Caption 10 of 24 Photos: In photos: Mass shooting at California barPeople comfort each other near the scene of a mass shooting at the Borderline Bar & Grill in Thousand Oaks, Californina, early Thursday, November 8.Hide Caption 11 of 24 Photos: In photos: Mass shooting at California barVentura County Sheriff Geoff Dean briefs reporters on the deadly shooting.Hide Caption 12 of 24 Photos: In photos: Mass shooting at California barA woman who fled from the shooting gets hugs from relatives in Thousand Oaks.Hide Caption 13 of 24 Photos: In photos: Mass shooting at California barAn FBI agent talks to a potential witness. Hide Caption 14 of 24 Photos: In photos: Mass shooting at California barOfficers stand near a police SUV at the shooting scene in an image from aerial video.Hide Caption 15 of 24 Photos: In photos: Mass shooting at California barMatt Wennerstorm, still wearing a blood-stained shirt, talks to members of the media outside the Borderline Bar & Grill.Hide Caption 16 of 24 Photos: In photos: Mass shooting at California barInvestigators in hazmat outfits work out of the command center at the shooting scene.Hide Caption 17 of 24 Photos: In photos: Mass shooting at California barPeople comfort each other near the shooting scene.Hide Caption 18 of 24 Photos: In photos: Mass shooting at California barWomen who fled from the shooting stand by a sheriff’s deputy.Hide Caption 19 of 24 Photos: In photos: Mass shooting at California barPeople await news about their friends in the Borderline Bar & Grill shooting.Hide Caption 20 of 24 Photos: In photos: Mass shooting at California barPeople walk away from the shooting scene.Hide Caption 21 of 24 Photos: In photos: Mass shooting at California barPolice vehicles block an intersection near the shooting in an image from aerial video.Hide Caption 22 of 24 Photos: In photos: Mass shooting at California barSheriff’s deputies speak to a possible witness.Hide Caption 23 of 24 Photos: In photos: Mass shooting at California barPeople console one another near the shooting scene.Hide Caption 24 of 24The gunman was in the Marine CorpsThe gunman was on active duty with the US Marine Corps from August 2008 to March 2013, according to Defense Department records.He posted information about his military service on a special forces forum called ShadowSpear in March 2017. Long said he had served in Afghanistan, was an infantry machine gunner in the Marine Corps for 4½ years, and was an instructor in Okinawa in Japan.”I was honorably discharged in 2013. I am graduating with a B.S. in Athletic Training in two months,” he wrote in the post. “I found out a little too late that just wasn’t the job for me. Maybe the ego got the better of me but it took only one time for a 19 year old D-2 athlete to talk down to me and tell me how to do my job that I realized this wasn’t the career I wanted to head.”Curtis Kellogg, a friend who served with Long, said Long headed to Southern California to pursue a degree in sports medicine after his service in Afghanistan.”He had a great sense of humor and like most Marines who have seen combat it could get dark at times, just like all of us,” Kellogg said. “He was excited to get out so he could go back home, ride his motorcycle again and finish school.”The gunman was a student at California State University, Northridge, majoring in athletic training from 2013 to 2016, but he did not graduate, university representative Carmen Ramos Chandler said.The gunman started firing suddenlyThe gunman was dressed in black and wearing glasses when he walked into the bar filled with people enjoying a night of line dancing.”I started hearing these big pops. Pop, pop, pop. There was probably three or four, I hit the ground,” John Hedge told CNN affiliate KABC.Holden Harrah told CNN the gunman opened fire within seconds.”This guy just came out of nowhere and came out with a gun and shot people in Thousand Oaks, California,” Harrah said. “And that’s what’s really blowing my mind, it’s a really safe area.”Reports of the shooting came in around 11:20 p.m. PT.”I heard a gunshot, I turned around and I saw him shoot a couple more times,” California Lutheran University student Teylor Whittler told KABC. “Within a split second, everybody yelled ‘get down,’ ” she said.Witnesses said that people dropped to the floor and hid behind bar stools in stunned silence. Others jumped over chairs and broke windows to get out of the bar.The gunman lived with his motherSheriff’s deputies stand outside Ian David Long’s house Thursday in Newbury Park, California.Dean said that investigators were seeking a search warrant to look through Long’s house, where he lived with his mother.A neighbor told CNN that Long’s mother “lived in fear” of what her son might do, saying when police were called to the house earlier this year “it took them about a half a day to get him out of the house.”Neighbor Richard Berge said Long’s mother told him she was concerned about her son, though not worried about her own safety, and that “she was … kind of beside herself, she didn’t know what to do because he wouldn’t get help.”Berge said that when he saw police activity at the house Thursday morning, “I knew what it was.”Another neighbor, Gareth Crites, said he rarely saw Long at the house. Crites would wave, but Long wouldn’t wave back, he told CNN affiliate KABC.