This 8 November 2018 video says about itself:
Thousand Oaks: Gunman kills 12 in California bar – BBC News
At least 12 people have been killed, including a police officer, at a bar in Thousand Oaks, California. Reports say the shooting began at about 23:20 local time on Wednesday at the Borderline Bar and Grill, about 40 miles (65km) north-west of Los Angeles. Another 10-12 people were injured in the attack.
From ABC in the USA:
What we know about Thousand Oaks shooting suspect
THOUSAND OAKS, Calif.
A suspect has been identified in the mass shooting at a California nightclub, two law enforcement sources told ABC News.
The shooting happened late Wednesday inside Borderline Bar & Grill in Thousand Oaks. At least a dozen people were killed, including a sheriff’s sergeant, Ron Helus. None of the other victims have been identified.
Earlier Thursday morning, authorities said the gunman was found dead inside the nightclub. The motive is not clear and is under investigation, the law enforcement sources said. No name has been released for the suspect.
The suspect is a white man in his late twenties, according to ABC News. The Associated Press reported that he was 29.
His gun, which appears to be a .45-caliber handgun, was purchased legally, according to ABC News. AP reports that he also deployed a smoke device.
I wish strength and recovery to all survivors of this horrible crime.