SEVERAL people have reportedly been taken to hospital in the US following a shooting at YouTube headquarters in California.
Employees were evacuated after a shooter was reported at the media giant's offices in San Bruno.
Live TV footage last night showed officers searching people grouped outside a building and police vehicles surrounding the area.
San Bruno police said they could not provide more information.
The world's biggest online video website is located on a suburban campus.
YouTube employee Vadim Lavrusik posted on Twitter that he heard gunshots and saw people running.
He said he was barricaded in a room with his co-workers before being safely evacuated.
Will Hudson said his friend who works for YouTube texted him about the assailant.
"I think there might be a shooter in my building," read one text.
"The fire alarm went off so we started to evacuate and then people (started) running saying there was a shooter."
Mr Hudson said his friend has made it safely back to San Francisco and is in contact with his family.
Mr Hudson said he had become accustomed to hearing about such violence but has never been so close to it before.
"It just feels strange. It feels like it could really be anyone. That's really the strangeness of it," he said.
