Female suspect dead in YouTube HQ shooting
Four people were injured by a female shooter who killed herself after going on a gun rampage at YouTube's California headquarters.
San Bruno Police chief Ed Barberini said the woman was found dead in the building with a "self-inflicted wound".
The condition of the injured, who have been taken to hospital, was not confirmed last night. Early reports said at least one was critical.
According to witnesses, the woman - dressed in a headscarf - shot her boyfriend then herself. The first reports came at 12.46pm local time (8.46pm UK time) when dozens of employees called police.
Officers who arrived found the woman dead inside.
TV helicopter video shows officers searching people grouped outside a building and police vehicles surrounding the area. A spokeswoman for California's Stanford Hospital said it had received four to five patients from the shooting but had no information about their condition.
President Donald Trump tweeted last night: "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."
YouTube, the world's biggest online video website, is located on a suburban campus.
Employee Vadim Lavrusik posted on Twitter that he heard gunshots and saw people running. He said he was barricaded in a room with co-workers before being safely evacuated.
California Senator Dianne Feinstein said she was praying for those at the scene.