This story has been updated.
Three people have been shot following at shooting at YouTube's headquarters in San Bruno, San Mateo County.
Police were called to the scene after numerous 911 calls were made reporting gun fire on the campus. It resulted in three people being shot, who were later taken to hospital by emergency services.
One person is deceased, believe to be the shooter, as the result of a self-inflicted wound.
Earlier YouTube staff members had reported on Twitter that there was an "active shooter" at the campus.
Vadim Lavrusik, product management at YouTube, tweeted he had “heard shots and saw people running while at my desk. Now barricaded inside a room with coworkers”.
He later tweeted he was out of the building and “safe”.
UX designer Lilian Chen tweeted: “I am hiding barricaded holy shit.”
She later said she had been evacuated: “I got evacuated outside with my hands up. I’m with other people. I don’t think the shooter’s been found that I know of. I saw blood drops on the stairs I walk up everyday. I’m shaking. This is surreal. I hope my colleagues are okay".
Safe. Got evacuated it. Outside now.— Vadim Lavrusik (@Lavrusik) April 3, 2018
I got evacuated outside with my hands up. I’m with other people. I don’t think the shooter’s been found that I know of. I saw blood drops on the stairs I walk up everusay. I’m shaking. This is surreal. I hope my colleagues are okay.— Lil | Milktea (@_lilchen) April 3, 2018
After initially confirming an "emergency situation" as social media reports came in, the San Bruno Police Department released a tweet stating that there was an "active shooter" in the area and warned locals to stay away from Cherry Avenue and Bay Hill Drive.
Broadcast news channels later showed employees leaving the campus in a queue with their hands raised as they were frisked by police for possible firearms.
Google CEO Sundar Pichai released a statement following the shooting expressing thanks to the first responders and its security team for keeping people safe.
US President Donald Trump also made a statement on the matter.
Was just briefed on the shooting at YouTube’s HQ in San Bruno, California. Our thoughts and prayers are with everybody involved. Thank you to our phenomenal Law Enforcement Officers and First Responders that are currently on the scene.— Donald J. Trump (@realDonaldTrump) April 3, 2018