Thousand Oaks shooter used .45-caliber handgun with extended magazine

EMBED </>More Videos

Thousand Oaks shooting suspect Ian David Long had contact with law enforcement authorities before. (Mark J. Terrill/AP Photo)

The gun used in the Thousand Oaks mass shooting was a Glock 21 .45-caliber handgun, Ventura County Sheriff Geoff Dean said during a news conference.

Dean said in California, the gun is designed to hold 10 rounds, and then one in the chamber, but the weapon used in the shooting had "an extended magazine on it."

Authorities do not yet know how many rounds were fired. According to ABC News, the gun was purchased legally.

The shooting left 13 people dead, including the gunman, identified as Ian David Long. The preliminary information was that the suspect killed himself.

>>>Mass shooting at Borderline Bar and Grill in Thousand Oaks leaves 13 dead, including gunman

>>>What we know about Thousand Oaks shooting suspect

Dean said detectives are investigating whether Long suffered from post-traumatic stress disorder. Long served in the U.S. Marine.

According to Dean, Long had minor run-ins with law enforcement, including an incident in April in which deputies were called to his home in Newbury Park on a report that he was acting erratically.

"They went to the house, they talked to him. He was somewhat irate, acting a little irrationally. They called out our crisis intervention team, our mental health specialist, who met with him, talked to him and cleared him, didn't feel that he was qualified to be taken under 5150," Dean said.

>>>Hero saves as many as 30 people during Thousand Oaks mass shooting

>>>Thousand Oaks shooting: Sheriff Sergeant Ron Helus was 'hard working, dedicated' and 'died a hero'

EMBED More News Videos

Ventura County Sheriff Geoff Dean talks about Sgt. Ron Helus, who was killed in the shooting.

Related Topics:
mass shootingshootingnightclubventura county sheriff's departmentcollege studentsthousand oaks mass shootingThousand OaksVentura County
(Copyright ©2018 KABC-TV. All Rights Reserved.)