The Last Word with Lawrence O'Donnell 04/17/13

Boston blast investigators identify a face

Authorities tell NBC News that investigators identified a face, but not the name of someone seen on camera dropping a black bag near the second Boston blast site. MSNBC's Lawrence O'Donnell discusses the latest evidence with NBC News's Michael Isikoff and former ATF special agent James Cavanaugh. ... more Duration: {{video.duration.momentjs}}