Latest: Woman, believed to be shooter, dead and at least four injured at YouTube campus shooting

Police in California are responding to reports of a shooting at YouTube headquarters in the city of San Bruno.

Update - 10.43pm: The Chief of Police at San Bruno, Ed Barberini, says they have found one dead person, said to be female, who appears to have shot themselves.

She is believed to be the shooter at YouTube's California headquarters, but it has not been confirmed as yet.