(RNN) - Police in San Bruno, CA, are responding to an active shooter at YouTube's headquarters.
Police tweeted for people to stay out of the area due to police activity.
Employees are exiting the building with their hands up and are being frisked by police.
YouTube is a free video sharing and streaming service. Originally created in 2005, YouTube is one of the most popular sites on the Web. Visitors watch billions of hours of video every month.
YouTube also has a TV service that streams network programming.