PoliticsNation with Al Sharpton 04/19/13

How does homegrown terror happen?

While it is unconfirmed if a “radicalizing” process took place with the Tsarnaev brothers, NBC News Terrorism Analysts Roger Cressey and Evan Kohlmann describe what that process usually entails and the questions left unanswered in the Boston manhunt. ... more Duration: {{video.duration.momentjs}}