At least three people watched a livestream of gunmen killing three people at the Islamic Center of San Diego, according to a CBS News analysis of footage from the attack. One viewer urged another to alert law enforcement, but it is not clear if anyone did. A recording of the attack later circulated online, including on so-called "gore websites" that have previously served as gathering places for admirers of mass shooters. CBS News' Anna Schecter, senior coordinating producer for CBS News and Stations' Crime and Public Safety Unit, reports on how footage of this devastating crime was disseminated online #sandiego #crime #news #investigation