Woman opens fire at YouTube, wounds 3 before killing herself

SAN BRUNO, Calif. — A woman opened fire Tuesday at YouTube headquarters, wounding three people before fatally shooting herself as terrified employees huddled inside, police and witnesses said.After receiving multiple 911 calls reporting gunfire, officers and federal agents swarmed the company's suburban campus sandwiched between two interstates in the San Francisco Bay Area city of San Bruno.YouTube employee Dianna Arnspiger said she was on the building's second floor when she heard gun sh