Authorities say Umar Farouk AbdulMutallab used a pair of underwear to smuggle explosives onto Northwest Flight 253 last week. The big worry is that it was never detected by airport security.
A federal report obtained by CNN says the 23-year-old Nigerian claims he got the bomb in Yemen, along with instructions on how to use it. A branch of al Qaeda in Yemen is now claiming it was behind the plot. Our Jeanne Meserve has the report.