The Last Word with Lawrence O'Donnell 04/23/13

FBI is ‘increasingly confident’ Tsarnaev brothers acted alone

Investigators have found that the Tsarnaev brothers were motivated by religious fervor and the American wars in Afghanistan and Iraq while the mother of the suspects refuses to believe that her sons have committed a crime. Terrorism analyst Michael Leiter and MSNBC’s Joy Reid discuss the latest developments in the bombing investigation. ... more Duration: {{video.duration.momentjs}}