December 4, 2015 12:35 pm FBI Probes Shooting as Act of Terrorism The FBI officially announced at a news conference that the San Bernardino mass shooting was being investigated as an act of terrorism. Toni Guinyard reports for the NBC4 News at Noon on Friday, Dec. 4, 2015. US & World Videos 5:55 NewsConference: Can California move past its struggles? 6:12 NewsConference: LA city attorney on sanctuary city status, goals for next year 6:44 NewsConference: Adam Schiff talks possible pardon before office change 3:34 Devoted Billie Eilish fans line up early outside the Kia Forum 0:43 Fire breaks out at commerical Warehouse in Commerce