Police tweeted Tuesday that they were responding to a scene at 901 Cherry Ave, which is the address of YouTube's headquarters. Images released online showed SWAT teams descending onto the scene as persons from the building exited with their arms raised. A negotiator was reportedly brought to the scene.
Brent Andrews, the spokesperson for Zuckerberg San Francisco General Hospital, stated during a briefing that two women and one man were taken to the hospital. One of the women is in serious condition and the man is in critical condition. Reuters reported earlier that Stanford Health Care Hospital was expecting four to five victims.
According to San Bruno Police Chief Ed Barberini, officials transferred four victims to local hospitals with gunshot injuries. One woman, believed to be the shooter who carried a handgun, was found inside the building with a self-inflicted wound. Barberini described the scene as "very chaotic."
Connie Jackson, the city manager for San Bruno, told local reporters that there is no longer an immediate threat.
Social media users shared images of police on the scene.
Employees from the video-sharing company took to Twitter to share what they experienced leading up to the shooting incident. Multiple 911 calls were made by several employees, Jackson told KRON4.
YouTube's parent organization Alphabet Inc. released a statement indicating that officials were investigating a possible gunfire incident at the location.
The Bureau of Alcohol, Tobacco, Firearms and Explosives and the FBI are working alongside the San Bruno Police Department. YouTube's headquarters has roughly 1,100 employees.