Investigators said Tuesday they still don't know why 28-year-old Ian David Long attacked staff and customers at the Borderline Bar and Grill in the Los Angeles suburb of Thousand Oaks on Nov. 7.

The gunman who killed 12 people at the Borderline Bar & Grill in Thousand Oaks, California, was a 28-year-old veteran of the Marine Corps who had previous run-ins with the law, officials said.

Suspected Thousand Oaks mass shooter Ian David Long used legally purchased .45-caliber handgun: Officials At least 12 people were killed in the shooting.

THOUSAND OAKS, Calif. — Neighbors of Ian David Long described the man who shot and killed 12 people at a country music bar as distant in public but combative with his mother inside the suburban ...

Law enforcement officials say authorities have identified the gunman and the weapon he used to kill 12 at a bar in California.

Ian David Long’s behavior alarmed roommates and neighbors, and drew police to his home, but never became threatening enough for him to be taken into custody for mental health treatment.

Law enforcement has identified Ian David Long as the shooter in Wednesday's deadly shooting near Los Angeles. The 28-year-old former Marine had several prior contacts with authorities, including ...

Former high school track coach Evie Cluke talks about her interactions with Ian David Long, who authorities say shot and killed 12 people at a Southern California bar on Wednesday, during an ...

Police identified 28-year-old Ian David Long as the suspect in the shooting at a Thousand Oaks, Calif., bar that left at least 13 dead, including the suspected gunman.

NEWBURY PARK, Calif. -- A former track coach at Newbury Park High School in California says Ian David Long, the 28-year-old suspect in the Wednesday mass shooting at a Thousand Oaks bar, assaulted ...

Instagram has taken down the social media posts Ian David Long sent during the Thousand Oaks shooting Wednesday night.

The gunman who killed 12 people at the Borderline Bar & Grill in Thousand Oaks, California, was a 28-year-old veteran of the Marine Corps who had previous run-ins with the law, officials said.