Gunshots were fired Tuesday at the YouTube headquarters in San Bruno, Calif., according to multiple reports. The San Bruno police department tweeted that there was police activity at the company's address and asked the public to avoid the area, but did not immediately respond to a request for comment. Several verified Twitter Inc. TWTR, -1.78% users who work at YouTube described an active shooter and an attempt to evacuate YouTube employees from the building. YouTube is a unit of Alphabet Inc. GOOGL, +0.60% GOOG, +0.69%