YouTube shooting: Woman wounds three at headquarters in California

A woman opened fire at the campus of Google's YouTube, wounding three on Tuesday. The San Bruno Police Department said it is investigating a motive for this shooting. Earlier reports indicated the suspect may have known one of the victims, but police said late Tuesday that "at this time there is no evidence that the shooter knew the victims of this shooting or that individuals were specifically targeted." A YouTube product manager, Todd Sherman, described on Twitter hearing people running, first thinking it was an earthquake before he was told that a person had a gun.