NOW With Alex Wagner 04/22/13

Was Tamerlan the mastermind and Dzhokhar 'brainwashed'?

The Huffington Post's Ryan Grim, the Grio's Joy Reid, BBC's Katty Kay and the National Journal's Ron Fournier join Alex Wagner for the latest updates in the investigation into the Boston Marathon bombings. NBC News' Pete Williams reports. ... more Duration: {{video.duration.momentjs}}