'Active shooter' at Youtube headquarters shot dead

A female gunman reportedly died of a self-inflicting gunshot in an incident of cross-firing at the headquarters of the YouTube on Tuesday at San Bruno in California.

Further, four civilians were reportedly injured in the incident.

According to the media reports, the South Francisco police posted on its Twitter handle to warn people to stay away from the YouTube's office.

"We are responding to an active shooter. Please stay away from Cherry Ave & Bay Hill Drive", South Francisco Police tweeted.

Reportedly one of the YouTube employees said to have heard gunshots following which the employees were made to evacuate the office building.

The YouTube office has now been barricaded.