At least one casualty is reported after a woman shot her boyfriend at YouTube headquarters in San Bruno, California.
The woman reportedly turned the gun on herself after the shooting. She was pronounced dead at the scene.
It isn't clear if the woman or her boyfriend were employees of Youtube.
The incident happened at 12:15 p.m. West Coast time.
A city official confirmed the man is in critical condition, and three women are in stable condition with gunshot wounds at a hospital.
San Bruno Police Chief Ed Barberini confirmed there are four victims in total, not including the deceased woman.
The chief says the shooting was a domestic violence incident and not domestic terrorism.