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 / Updated By Andrew Blankstein and Jo Ling Kent 
 
 The former Marine who fatally shot 12 people inside a California bar posted a message on social media during the attack saying he was bored but sane, law enforcement officials told NBC News. 
 
 Ian David Long, 28, also wrote that he knew his mental state would be debated for years, law enforcement officials said. 
 
 Long made two separate posts amid his shooting rampage at the Borderline Bar and Grill in Thousand Oaks Wednesday night, the officials said. 
 
 The law enforcement sources did not specify which social media platforms he used. 
 
 A spokesperson for Facebook, which owns Instagram, declined to comment on whether anything had been posted to Facebook or Instagram. Facebook also said no story was posted on Instagram but wouldn't elaborate further, deferring to law enforcement. 
 
 Twitter did not return a request for comment. 
 
 On Thursday, Facebook spokeswoman Sarah Pollack said: "Our hearts are with the victims and families affected by this horrendous act. We've removed the shooter's accounts from Facebook and Instagram and will remove any praise or support for the crime or the shooter as soon as we're aware." 
 
 Long’s use of social media was first reported by TMZ. 
 
 Investigators are still piecing together a precise timeline on the shooting that killed 12 bar employees and patrons. But it's believed that Long, who was dressed in black and armed with a high-powered Glock handgun with an extended magazine, entered the Borderline Bar & Grill about 11:15 p.m. 
 
 It's not exactly clear when he posted the social media messages, but law enforcement officials said that he walked to the back of the bar after hearing the sounds of police sirens and began indiscriminately firing on patrons. 
 
 The officials said he took a position of cover before fatally shooting Sgt. Ron Helus of the Ventura County Sheriff's Office. 
 
 Investigators believe Long then shot additional victims inside the bathroom stalls, as well as at least one person who was trying to escape through the bathroom window, the law enforcement officials said. 
 
 Ian Long, 28, who is a veteran of the Marines, has been identified as the shooter at Borderline Bar and Grill in Thousand Oaks, California. via Facebook 
 
 A short time later, Long was found dead of a suspected self-inflicted gunshot wound. 
 
 Authorities said Long, a former Marine gunner who served one tour in Afghanistan, had been experiencing emotional issues. 
 
 Investigators are still trying to figure out the motive for the attack. 
 
 When authorities entered his home in nearby Newbury Park, they found evidence that he punched multiple holes in the walls, law enforcement officials said. 
 
 Local cops were called to his home for a domestic disturbance earlier this year, authorities said. Long was found to be "somewhat irate" and "acting a little irrationally" but he wasn't taken into custody. ||||| Thousand Oaks Bar Shooting Suspect Posted on Instagram During Massacre Possible Revenge Motive 
 
 Thousand Oaks Bar Shooter Ian Long Posted on Instagram During Killings 
 
 EXCLUSIVE 
 
 12:15 PM PT -- Our sources say Long posted the same message on his Instagram and Facebook, "I hope people call me insane .. wouldn't that just be a big ball of irony? Yeah ... I'm insane, but the only thing you people do after these shootings is "hopes and prayers" .. or "keep you in my thoughts" ... every time ... and wonder why these keep happening ..." The shooter who terrorized college students at Borderline Bar & Grill was shockingly on social media as he shot a dozen people dead, and, based on what we now know, it sounds like they were revenge killings. 
 
 Law enforcement sources tell us Ian Long held a gun in one hand and his phone in the other, posting messages on his Instagram during Wednesday night's massacre. 
 
 Our sources say investigators discovered the messages on Long's page several hours after the shooting and contacted Instagram to delete his page. We don't know precisely what he was saying, but it appears he had a grudge he was carrying out. 
 
 A former classmate of Long's tells TMZ, Long was bullied in high school. She says his fellow students made fun of him because he had a lazy eye, and it affected him deeply. The classmate says a lot of those students go to that bar on Wednesday nights. She says he knew some of the people who teased him would be there. 
 
 We're told he was a regular at the bar, usually keeping to himself ... grabbing a beer and sitting at the bar. 
 
 As we reported, Long served in Afghanistan from 2010 to 2011 as a decorated member of the Marines. His classmate says Long suffered serious PTSD after his tour and tried to get help from therapists and doctors. We're told he also reached out to the military for help, but his mental health was in bad shape. ||||| Breaking News Emails Get breaking news alerts and special reports. The news and stories that matter, delivered weekday mornings. 
 
 / Updated By Andrew Blankstein, Jonathan Dienst, Tom Winter and Brandy Zadrozny 
 
 The gunman suspected of fatally shooting 12 people at a California bar has been identified as a 28-year-old former Marine who had been experiencing emotional issues, authorities said. 
 
 Ian Long opened fire inside the Borderline Bar & Grill in Thousand Oaks during a "college country night," authorities said. He was found dead in the bar of a suspected self-inflicted gun shot wound, authorities said. 
 
 "We have no idea what the motive is at this point," said Ventura County Sheriff Geoff Dean. 
 
 Police were called to Long's home in Newbury Park in 2018 for a domestic dispute where he was found to be "somewhat irate and acting irrationally," Dean said. 
 
 Dean said mental health workers examined Long at the time, but decided not to take him in for further observation. 
 
 Ian Long, 28, who is a veteran of the Marines, has been identified as the shooter at Borderline Bar and Grill in Thousand Oaks, California. via Facebook 
 
 Were it not for the row of news trucks lined up out front, Long's block in Newbury Park would look like another slice of sleepy Americana. 
 
 There are stucco homes with well-kept yards and festive decorations left over from Halloween. Many of the residents fly American flags. 
 
 But neighbors say the placid street belied the tempestuous behavior of Long, who arrived with his mother about a dozen years ago as a teenagers. 
 
 Neighbors said they sporadically heard screaming matches from inside the home, often punctuated with profanities from the young man. 
 
 The man seemed more agitated and unsettled when he returned from the military a few years ago, said Don and Effie MacLeod, who live over the back fence. 
 
 "One look at the guy and you could tell something was wrong," said Don MacLeod. "He was full of bad temper." 
 
 Near the end of one argument about 18 months ago, MacLeod heard what he was sure was a gunshot from the home but the voices continued, so he was convinced no one had been hurt and did not call the police. 
 
 Neighbors recalled the response of Ventura County sheriff's deputies in April. Law enforcement was summoned based on reports of loud noises coming from Long's residence, they said. 
 
 But whoever evaluated Long apparently did not think he was a threat to himself or others, the standard for authorities executing an involuntary psychiatric evaluation. 
 
 "I can't see how he got through two checkpoints, being in the military and then being evaluated by the police," said Don MacLeod. "Why? Why?" 
 
 Tom Hanson said he called authorities after hearing what he described as loud noises that sounded like his neighbor was tearing down the walls of his house. 
 
 "I didn't know if he was hurting himself," Tom Hanson told reporters. 
 
 Hanson said deputies spoke to Long and then left. "Everything seemed to go back to normal after that," Hanson said. 
 
 Long left the Marine Corps in March 2013 after a five-year stint that included a tour in Afghanistan's restive Helmand Province. 
 
 A machine gunner, Long's Afghanistan deployment stretched from Nov. 2010 to June 2011. 
 
 A year later, Long appears to have posted a revealing message in an online military forum in reply to a note from another member. 
 
 The member posted about not knowing "how long you want to be in the fight until you've been in the fight?" 
 
 Long apparently replied, "yup, it's either an addiction or a nightmare." 
 
 Blake Winnett says he shared a house with Long for more than two years after Long answered a Craigslist advertisement for a roommate in 2012. 
 
 He described the man as a recluse who liked motorcycling, electronic music and dancing by himself in a closed garage "in 100 degree weather." 
 
 "I would try to take him out to the bars and, you know, it was like pulling teeth sometimes, but I'd get him out there," Winnett said. 
 
 "I want to set things straight," he said. "He wasn't a bad person." 
 
 In March 2017, Long appears to have written that he was two months away from a bachelor's degree in "Athletic Training," but no longer desired to work in that field. 
 
 "I found out a little too late that just wasn’t the job for me," read the post. "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." 
 
 Long also apparently wrote that he was choosing to stay enlisted because of "how much quicker (with my prior service) it would be to get into the regiment rather than going to the dark side." 
 
 Long is a former student at California State University, Northridge, where he last attended in 2016, according to a statement from the university's president, Dianne F. Harrison. 
 
 A Marine Corps spokesperson released a statement Thursday morning. "The Marine Corps extends its deepest condolences to the families of the victims in this senseless tragedy," the statement read. 
 
 An FBI agent talks to a potential witness as they stand near the scene Nov. 8, 2018, in Thousand Oaks, California, where a gunman opened fire inside a country dance bar. Mark J. Terrill / AP 
 
 A woman believed to be Long's mother posted a series of photos on her Facebook page showing a young man in military tactical gear. 
 
 In one photo, he's seen standing in front of a cement wall with a white puppy peeking out of his backpack. 
 
 "Now that's cute," she wrote. 
 
 Court records show that Long was arrested for speeding in Ventura County in 2013. That same year, he appears to have divorced his wife, according to court records. 
 
 Long was dressed in all black and wearing a hood when he entered the bar and squeezed off multiple rounds at unsuspecting revelers, according to witnesses. 
 
 The victims included Ventura County Sgt. Ron Helus, a 29-year veteran of the department. 
 
 Dean said Long was armed with a legally purchased .45-caliber Glock handgun with an extended magazine. 
 
 In addition to his run-in with police earlier this year, Long was the victim of an assault at a local bar in Thousand Oaks and had been involved in two traffic accidents, Dean said.
– The man who authorities say shot to death 12 people at a California bar on Wednesday was posting to social media during the attack, according to NBC. TMZ reports that sources say that Ian Long, a 28-year-old former Marine who also died in the attack, had a gun in one hand and his phone in the other during his rampage at the Borderline Bar and Grill in Thousand Oaks and posted a message to Instagram and Facebook, writing in part: “I hope people call me insane .. wouldn’t that just be a big ball of irony.” Facebook, which owns Instagram, declined NBC’s request for a comment, but did say that it had taken down Long’s accounts “and will remove any praise or support for the crime or the shooter as soon as we’re aware.” A law enforcement official tells the AP that investigators still haven’t determined a motive for the attack, adding that they are looking onto whether Long, who they believe killed himself, thought his ex-girlfriend would be at the bar. TMZ sources say that the attack was motivated by revenge, with one saying that Long had been bullied in high school and many of those former classmates often spent Wednesdays at the bar, where Long was reportedly a regular.