Neighbor claims Calif. bar shooter was a veteran who suffered from PTSD: 'I have no idea what he was doing with a gun'

A neighbor of California bar shooter Ian David Long told reporters that he was a military veteran who may have struggled with post-traumatic stress disorder.

An unidentified female neighbor who claimed she knew Long told KABC reporters near the suspect's home in Newbury Park, Calif., that the suspect should likely not have had access to a firearm due to his alleged condition.

"I don't know what he was doing with a gun," she said.

Another neighbor, who spoke anonymously with ABC News, said Long was a homebody who lived with his 61-year-old mother and would rarely go outside. The neighbor also claimed that Long's mother recently confided that her son was growing "violent."

Wednesday's attack on the Borderline Bar & Grill in Thousand Oaks, Calif., left 12 people dead, including one law enforcement official.

Long was also found dead at the bar from a gunshot wound, although it remains unclear if the wound was self-inflicted or if the shooter was gunned down by police.

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Mass shooting at Borderline Bar and Grill in Thousands Oaks, California
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Mass shooting at Borderline Bar and Grill in Thousands Oaks, California
THOUSAND OAKS, CA - NOVEMBER 08: Tim Dominguez who was in the bar with his son distraught over the shooting sits under the freeway after a gunman opened fire late Wednesday at a Thousand Oaks bar packed with hundreds of people attending a popular event for college students, causing multiple fatalities on November 8, 2018 in Thousand Oaks, California. The gunman burst into the bar around 11:20 p.m., cloaked in all black as he threw smoke bombs and began shooting at targets as young as 18 inside the Borderline Bar & Grill, authorities and witnesses said. (Photo by Irfan Khan / Los Angeles Times via Getty Images)
In this image taken from video a victim is treated near the scene of a shooting, Wednesday evening, Nov. 7, 2018, in Thousand Oaks, Calif. A hooded gunman dressed entirely in black opened fire on a crowd at a country dance bar holding a weekly "college night" in Southern California, killing multiple people and sending hundreds fleeing including some who used barstools to break windows and escape, authorities said Thursday. The gunman was later found dead at the scene. (RMG News via AP)
In this image taken from video a victim is carried from the scene of a shooting, Wednesday evening, Nov. 7, 2018, in Thousand Oaks, Calif. A hooded gunman dressed entirely in black opened fire on a crowd at a country dance bar holding a weekly "college night" in Southern California, killing multiple people and sending hundreds fleeing including some who used barstools to break windows and escape, authorities said Thursday. The gunman was later found dead at the scene. (RMG News via AP)
In this image taken from video a victim is treated near the scene of a shooting, Wednesday evening, Nov. 7, 2018, in Thousand Oaks, Calif. A hooded gunman dressed entirely in black opened fire on a crowd at a country dance bar holding a weekly "college night" in Southern California, killing multiple people and sending hundreds fleeing including some who used barstools to break windows and escape, authorities said Thursday. The gunman was later found dead at the scene. (RMG News via AP)
THOUSAND OAKS, CA - NOVEMBER 08: Police work int he area after a gunman opened fire late Wednesday at a Thousand Oaks bar packed with hundreds of people attending a popular event for college students, causing multiple fatalities on November 8, 2018 in Thousand Oaks, California. The gunman burst into the bar around 11:20 p.m., cloaked in all black as he threw smoke bombs and began shooting at targets as young as 18 inside the Borderline Bar & Grill, authorities and witnesses said. (Photo by Irfan Khan / Los Angeles Times via Getty Images)
THOUSAND OAKS, CA - NOVEMBER 08: Security patrol after a gunman opened fire late Wednesday at a Thousand Oaks bar packed with hundreds of people attending a popular event for college students, causing multiple fatalities on November 8, 2018 in Thousand Oaks, California. The gunman burst into the bar around 11:20 p.m., cloaked in all black as he threw smoke bombs and began shooting at targets as young as 18 inside the Borderline Bar & Grill, authorities and witnesses said. (Photo by Irfan Khan / Los Angeles Times via Getty Images)
THOUSAND OAKS, CA - NOVEMBER 08: Sarah Rose DeSon talks to friends after a shooter wounded seven Wednesday night on November 8, 2018 in Thousand Oaks, California. The gunman burst into the bar around 11:20 p.m., cloaked in all black as he threw smoke bombs and began shooting at targets as young as 18 inside the Borderline Bar & Grill, authorities and witnesses said. (Photo by Al Seib / Los Angeles Times via Getty Images)
THOUSAND OAKS, CA - NOVEMBER 08: People leave the scene after a shooter wounded seven Wednesday night on November 8, 2018 in Thousand Oaks, California. The gunman burst into the bar around 11:20 p.m., cloaked in all black as he threw smoke bombs and began shooting at targets as young as 18 inside the Borderline Bar & Grill, authorities and witnesses said. (Photo by Al Seib / Los Angeles Times via Getty Images)
THOUSAND OAKS, CA - NOVEMBER 08: Molly Esterline is hugged by David Crawford on scene after a shooter wounded seven Wednesday night on November 8, 2018 in Thousand Oaks, California. The gunman burst into the bar around 11:20 p.m., cloaked in all black as he threw smoke bombs and began shooting at targets as young as 18 inside the Borderline Bar & Grill, authorities and witnesses said. (Photo by Al Seib / Los Angeles Times via Getty Images)
Jason Coffman displays a photo of his son Cody outside the Thousands Oaks Teene Center where he came hoping to find his son who was at the Borderline Bar and Grill in Thousand Oaks, California, on November 8, 2018. - Twelve people, including a police sergeant, were shot dead in a shooting at the bar close to Los Angeles, police said Thursday. All the victims were killed inside the bar in the suburb of Thousand Oaks late on November 7, including the officer who had been called to the scene, Sheriff Geoff Dean told reporters. The gunman was also dead at the scene, Dean added. (Photo by Frederic J. BROWN / AFP) (Photo credit should read FREDERIC J. BROWN/AFP/Getty Images)
An FBI agent talks to a potential witness as they stand near the scene Thursday, Nov. 8, 2018, in Thousand Oaks, Calif. where a gunman opened fire Wednesday inside a country dance bar crowded with hundreds of people on "college night," wounding 11 people including a deputy who rushed to the scene. Ventura County sheriff's spokesman says gunman is dead inside the bar. (AP Photo/Mark J. Terrill)
People comfort each other as they stand near the scene Thursday, Nov. 8, 2018, in Thousand Oaks, Calif. where a gunman opened fire Wednesday inside a country dance bar crowded with hundreds of people on "college night," wounding 11 people including a deputy who rushed to the scene. Ventura County sheriff's spokesman says gunman is dead inside the bar. (AP Photo/Mark J. Terrill)
People comfort each other as they sit near the scene Thursday, Nov. 8, 2018, in Thousand Oaks, Calif. where a gunman opened fire Wednesday inside a country dance bar crowded with hundreds of people on "college night," wounding 11 people including a deputy who rushed to the scene. Ventura County sheriff's spokesman says gunman is dead inside the bar. (AP Photo/Mark J. Terrill)
THOUSAND OAKS, CA - NOVEMBER 08: FBI setup for investigation at the Borderline and its parking lot after a gunman opened fire late Wednesday at a Thousand Oaks bar packed with hundreds of people attending a popular event for college students, causing multiple fatalities on November 8, 2018 in Thousand Oaks, California. The gunman burst into the bar around 11:20 p.m., cloaked in all black as he threw smoke bombs and began shooting at targets as young as 18 inside the Borderline Bar & Grill, authorities and witnesses said. (Photo by Irfan Khan / Los Angeles Times via Getty Images)
THOUSAND OAKS, CA - NOVEMBER 08: Police work in the area after a gunman opened fire late Wednesday at a Thousand Oaks bar packed with hundreds of people attending a popular event for college students, causing multiple fatalities on November 8, 2018 in Thousand Oaks, California. The gunman burst into the bar around 11:20 p.m., cloaked in all black as he threw smoke bombs and began shooting at targets as young as 18 inside the Borderline Bar & Grill, authorities and witnesses said. (Photo by Irfan Khan / Los Angeles Times via Getty Images)
THOUSAND OAKS, CA - NOVEMBER 08: Witnesses console each other near the Borderline Bar & Grill after a shooter wounded seven Wednesday night on November 8, 2018 in Thousand Oaks, California. The gunman burst into the bar around 11:20 p.m., cloaked in all black as he threw smoke bombs and began shooting at targets as young as 18 inside the Borderline Bar & Grill, authorities and witnesses said. (Photo by Wally Skalij / Los Angeles Times via Getty Images)
THOUSAND OAKS, CA - NOVEMBER 08: Police work in the area with dogs after a gunman opened fire late Wednesday at a Thousand Oaks bar packed with hundreds of people attending a popular event for college students, causing multiple fatalities on November 8, 2018 in Thousand Oaks, California. The gunman burst into the bar around 11:20 p.m., cloaked in all black as he threw smoke bombs and began shooting at targets as young as 18 inside the Borderline Bar & Grill, authorities and witnesses said. (Photo by Irfan Khan / Los Angeles Times via Getty Images)
THOUSAND OAKS, CA - NOVEMBER 08: A man speaks with law enforcement personnel as people stand along South Moorpark Road after a gunman opened fire late Wednesday at a Thousand Oaks bar packed with hundreds of people attending a popular event for college students, causing multiple fatalities on November 8, 2018 in Thousand Oaks, California. The gunman burst into the bar around 11:20 p.m., cloaked in all black as he threw smoke bombs and began shooting at targets as young as 18 inside the Borderline Bar & Grill, authorities and witnesses said. (Photo by Kent Nishimura / Los Angeles Times via Getty Images)
THOUSAND OAKS, CA - NOVEMBER 08: Nellie Wong cries as Chyann Worrell holds her and Erika Sigman (R) were all inside when shooting started inside the Borderline Bar & Grill when a shooter wounded seven Wednesday night on November 8, 2018 in Thousand Oaks, California. The gunman burst into the bar around 11:20 p.m., cloaked in all black as he threw smoke bombs and began shooting at targets as young as 18 inside the Borderline Bar & Grill, authorities and witnesses said. (Photo by Al Seib / Los Angeles Times via Getty Images)
An 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 at the Borderline Bar and Grill in Thousand Oaks, California on November 8, 2018. - Twelve people, including a police sergeant, were shot dead in a shooting at the bar close to Los Angeles, police said Thursday. All the victims were killed inside the bar in the suburb of Thousand Oaks late on November 7, including the officer who had been called to the scene, Sheriff Geoff Dean told reporters. The gunman was also dead at the scene, Dean added. (Photo by Frederic J. BROWN / AFP) (Photo credit should read FREDERIC J. BROWN/AFP/Getty Images)
People comfort each other as they stand near the scene Thursday, Nov. 8, 2018, in Thousand Oaks, Calif. where a gunman opened fire Wednesday inside a country dance bar crowded with hundreds of people on "college night," wounding 11 people including a deputy who rushed to the scene. Ventura County sheriff's spokesman says gunman is dead inside the bar. (AP Photo/Mark J. Terrill)
In this image taken from video a victim is treated near the scene of a shooting, Wednesday evening, Nov. 7, 2018, in Thousand Oaks, Calif. A hooded gunman dressed entirely in black opened fire on a crowd at a country dance bar holding a weekly "college night" in Southern California, killing multiple people and sending hundreds fleeing including some who used barstools to break windows and escape, authorities said Thursday. The gunman was later found dead at the scene. (RMG News via AP)
People walk away from the scene Thursday, Nov. 8, 2018, in Thousand Oaks, Calif. where a gunman opened fire Wednesday inside a country dance bar crowded with hundreds of people on "college night," wounding 11 people including a deputy who rushed to the scene. Ventura County sheriff's spokesman says gunman is dead inside the bar. (AP Photo/Mark J. Terrill)
People walk away from the scene Thursday, Nov. 8, 2018, in Thousand Oaks, Calif. where a gunman opened fire Wednesday inside a country dance bar crowded with hundreds of people on "college night," wounding 11 people including a deputy who rushed to the scene. Ventura County sheriff's spokesman says gunman is dead inside the bar. (AP Photo/Mark J. Terrill)
Sheriff's deputy speaks to a potential witness as they stand near the scene Thursday, Nov. 8, 2018, in Thousand Oaks, Calif. where a gunman opened fire Wednesday inside a country dance bar crowded with hundreds of people on "college night," wounding 11 people including a deputy who rushed to the scene. Ventura County sheriff's spokesman says gunman is dead inside the bar. (AP Photo/Mark J. Terrill)
Sheriff's deputies speak to a potential witness as they stand near the scene Thursday, Nov. 8, 2018, in Thousand Oaks, Calif. where a gunman opened fire Wednesday inside a country dance bar crowded with hundreds of people on "college night," wounding 11 people including a deputy who rushed to the scene. Ventura County sheriff's spokesman says gunman is dead inside the bar. (AP Photo/Mark J. Terrill)
People comfort each other as they stand near the scene Thursday, Nov. 8, 2018, in Thousand Oaks, Calif. where a gunman opened fire Wednesday inside a country dance bar crowded with hundreds of people on "college night," wounding 11 people including a deputy who rushed to the scene. Ventura County sheriff's spokesman says gunman is dead inside the bar. (AP Photo/Mark J. Terrill)
Sheriff's deputies speak to a potential witnesses as they stand near the scene Thursday, Nov. 8, 2018, in Thousand Oaks, Calif. where a gunman opened fire Wednesday inside a country dance bar crowded with hundreds of people on "college night," wounding 11 people including a deputy who rushed to the scene. Ventura County sheriff's spokesman says gunman is dead inside the bar. (AP Photo/Mark J. Terrill)
The inside of the Borderline Bar and Grill is seen after the shooting as police closed off the area in Thousand Oaks, California on November 8, 2018. - Twelve people, including a police sergeant, were shot dead in a shooting at a night club close to Los Angeles, police said Thursday. All the victims were killed inside the bar in the suburb of Thousand Oaks late on Wednesday, including the officer who had been called to the scene, Sheriff Geoff Dean told reporters. The gunman was also dead at the scene, Dean added. The bar was hosting a college country music night. (Photo by Frederic J. BROWN / AFP) (Photo credit should read FREDERIC J. BROWN/AFP/Getty Images)
People gather as close as they can to the Borderline Bar and Grill in Thousand Oaks, California on November 8, 2018 as police vehicles closed off the area responding to a shooting. - Twelve people, including a police sergeant, were shot dead in a shooting at a night club close to Los Angeles, police said Thursday. All the victims were killed inside the bar in the suburb of Thousand Oaks late on Wednesday, including the officer who had been called to the scene, Sheriff Geoff Dean told reporters. The gunman was also dead at the scene, Dean added. The bar was hosting a college country music night. (Photo by Frederic J. BROWN / AFP) (Photo credit should read FREDERIC J. BROWN/AFP/Getty Images)
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During a Thursday press conference, Ventura County Sheriff Geoff Dean said that Long, who served in the United States Marine Corps, had several prior interactions with the sheriff's department over the years. These included a traffic collision, a traffic citation and an instance in which Long was a victim of battery at a local bar in 2015.

In April 2018, authorities responded to Long's home on a report that he was acting erratically. Sheriff Dean said that though Long was found to be "somewhat irate" and "acting a little irrationally," he was cleared at the time by a crisis intervention team and a mental health specialist.

"PTSD might be a part of the conversation," Dean added of the April incident. 

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