Possible active shooter at YouTube HQ in San Bruno Possible active shooter at YouTube HQ in San Bruno SAN BRUNO (KRON) - KRON4 is hearing reports of an active shooter at YouTube's headquarters in San Bruno.  The City Manager tells KRON4 they've received multiple 9-1-1 calls from YouTube, however, they did not disclose the reasons why. The headquarters is located at 901 Cherry Avenue.  San Bruno Police tweeted at 1 p.m. to avoid the area due to police activity.