U.S. intelligence fears Americans who fought in Syria could be preparing for a domestic attack

There are growing concerns over Americans who traveled to fight in Syria planning to return home to launch attacks here. The FBI and the U.S. Intelligence community are working to track these individuals. Barbara Starr has new details on why this investigation is so complicated.

Anderson discussed the dangers of fighters who carry U.S. passports with National Security Analyst Fran Townsend, CIA and FBI counterterrorism official Philip Mudd and counterterrorism veteran Robert McFadden.