(RNN) – A shooter opened fire at YouTube headquarters in San Bruno, CA, Tuesday afternoon, wounding at least three people before taking her own life.
Police Chief Ed Barberini said the woman believed to be the shooter died of a self-inflicted gunshot wound. The shooter is believed to have known at least one of the victims, two law enforcement officials told CNN.
Zach Vorhies, a senior software engineer at YouTube, told the Associated Press that he and others were calmly leaving the building after a fire alarm went off, when he saw a shooter in the courtyard yelling, “Come at me, or come get me.”
Vorhies then saw a victim lying on his back with a possible gunshot wound to his stomach. Soon after, an officer carrying an assault rifle walked through a security door.
The San Francisco Chronicle described the victims as two women, ages 32 and 27, and a 36-year-old man.
The women are in serious condition and the man is listed as critical.
Reports of the shooting came in at 12:46 p.m. PT, just as lunch hour was ending.
Stanford Hospital says it has received patients from a shooting at YouTube headquarters, according to the AP.
San Francisco General Hospital spokesman Brent Andrew told KPIX the hospital received patients from the incident but could not confirm a number.
Todd Sherman, an employee at YouTube, tweeted about the ordeal. He was sitting in a meeting when he heard people running.
He first thought it was an earthquake. But when he left the room, he saw more people running and figured it was not some kind of drill.
As he headed toward the exit, someone informed him there was a person with a gun.
He looked down and could see blood drops on the floor and stairs.
Employees are exiting the building with their hands up and are being frisked by police.
White House Press Secretary Sara Huckabee Sanders told White House reporters that President Trump has been briefed on the shooting.
READ MORE: Cleveland19.com
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UPDATE: Three Injured in YouTube Shooting, Female Shooter Dead was originally published on wzakcleveland.com