The FBI is hoping to build a clear profile of a former U.S. Marine combat veteran who killed 12 people in a crowded Los Angeles area bar to discover a motive for the latest shooting massacre in the United States.

CALIFORNIA fires across Ventura County are forcing thousands of residents to flee days after a deadly mass shooting killed 12 in their Thousand Oaks community.

Thousand Oaks shooting: All 12 victims identified

Twelve people died late Wednesday after a gunman opened fire on a crowd gathered for a weekly country music dance night popular with college students at a bar in Thousand Oaks, California.

How a night out turned into a night of horror at a bar in California

The Borderline Bar & Grill was packed with patrons line dancing or playing pool. It was country college night, and people swayed to the beat as music blared through the speakers. Then a gunman burst in and killed 12 people.

Victims of California bar shooting massacre named

Read Victims of California bar shooting massacre named latest on ITV News. All the World news

'Oh, son! I love you so much': The victims of the Thousand Oaks shooting

The victims of the California bar shooting include an actress' niece, an aspiring soldier and a hero sheriff's sergeant.

THOUSAND OAKS, Calif. (AP) — Barely a year after surviving a massacre at a country music festival in Las Vegas, Brendan Kelly found himself in a terrifyingly familiar scene. Kelly, 22, said he was dancing with friends at a bar in suburban Los Angeles on Wednesday night when the bullets began flying. When the gunfire was over, 12 people were dead, including a Navy veteran who had lived through the deadliest mass shooting in modern U.S. history a year ago. "I already didn't wish it on anybody to begin with for the first time," Kelly said outside his home in Thousand Oaks. "The second time around doesn't get any easier."

California gunman was volatile but passed mental assessment California gunman was volatile but passed mental assessment

THOUSAND OAKS, Calif. — Neighbours 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 Los . . .

Telemachus Orfanos, 27, survived the shooting at a country music concert in Las Vegas in October 2017, but was among the 12 killed on Wednesday at the bar in Thousand Oaks, California.

Thousand Oaks shooting victim, survivors lived through Vegas massacre Thousand Oaks shooting victim, survivors lived through Vegas massacre

''He made it through Las Vegas, he came home. And he didn’t come home last night.''