Police are trying to understand why a woman opened fire on the YouTube offices near San Francisco Tuesday afternoon before apparently killing herself in a chaotic scene that left four others injured and employees huddled under their desks or running for safety.
Police swarmed the three-story building around 1 p.m. two minutes after YouTubers frantically called 911 to report the shooting. The first responding officers found the female suspect — rare in this kind of incident — was found dead of an apparent suicide, San Bruno Police Chief Ed Barberini said at a news conference.
The woman, who hasn't been identified, was found with a handgun. The shooting is being investigated as a domestic dispute, two law enforcement officials told the Associated Press. The officials with knowledge of the investigation spoke to The Associated Press on the condition of anonymity because they were not authorized to discuss it.
Barberini said the injured were found at the building and at an adjacent business. Police cautioned people to stay away from the building, which is on Cherry Avenue, about 11 miles south of San Francisco.
Barberini said "we don't know the circumstances" of why the woman opened fire, adding the investigation is just beginning.
It's still unclear how the person was able to make it inside the building and whether there was any security.
Several hospitals said they received patients, including San Francisco General Hospital.
Brent Andrew, a spokesman for the hospital, said they received three patients — a woman and two men. One person was in critical condition.
Dr. Andre Campbell said all three were hit with bullets. San Bruno police said a fourth person had a twisted ankle or similar injury but wasn't shot.
"You think after we saw Las Vegas and Parkland and the Pulse nightclub shooting that we would see an end to this, but we have not," Campbell said of the gun violence. "We've got a serious problem that we need to address."
Photos on social media showed hundreds of people being escorted by law enforcement out of the building with their hands up. Employees of the company say they heard what sounded like shots and took cover.
After being escorted out of the building, helicopter footage showed those inside being patted down by police.