The FBI is examining the underwear bomb at the center of the latest foiled Al-Qaeda plot to bomb a US airliner.
FBI director Robert Mueller told a Congressional committee about the plot Wednesday.
According to reports, the plan was for a suicide bomber to board a plane wearing a new kind of non-detectable explosive devise in his briefs.
But the plot wasn't carried out because the designated bomber was reportedly a double agent working for Saudi intelligence and the CIA.
Anchor Marco Werman talks to Tim Weiner, the author of "Enemies: A History of the FBI" and "Legacy of Ashes: The History of CIA."