From Minneapolis to Mogadishu

Al-Shabaab, the terrorist group claiming responsibility for Saturday's attack on a mall in Nairobi, is based in Somalia. But the organization has a history of trying to recruit in the West, and some alleged that two or three Americans were among the gunmen in this weekend's assault.

Brian Todd reports from Minneapolis, Minnesota, a major recruiting ground for the group, on how they have been so successful in recruiting young Somali American men.