Fox News is reporting the shooter is believed to be dead by the police, and 4 people were wounded.
NBC News is reporting that the shooter is female and is down.
Reports are hitting social media of an active shooter at the campus of YouTube HQ in San Bruno, CA. Claims are running wild of shots fired on the company campus. The police are not confirming the shooting at this time, but they posted to their Twitter account the following:
901 Cherry Ave in San Bruno is YouTube HQ.
Employees at YouTube are claiming to hear gunshots and are barricading themselves in.
This is developing, so details are sparse and unconfirmed. Police are on the scene and responding to an event there.