MSNBC Live with Thomas Roberts 12/03/15

Police: Attackers left behind pipe bomb-type devices

Former NYPD officer Brian Levin, currently the director of the Center for the Study of Hate and Extremism at California State University in San Bernardino, joins Thomas Roberts on the changing nature of terror threats to the mainland and reports that the San Bernardino suspects may have been radicalized. ... more Duration: {{video.duration.momentjs}}