"Al Qaeda's would-be underwear bomber was CIA informant."

"Officials, speaking on condition of anonymity, say the supposed would-be bomber in Al Qaeda airliner plot was actually an informant working for the CIA."

AND:

A senior American official said the device was sewn into “custom fit” underwear that would have been very difficult to detect even in a careful pat-down. Unlike the device used in the unsuccessful December 2009 plot to blow up an airliner over Detroit, this bomb could be detonated in two ways, in case one failed, the official said.

The main charge was high-grade military explosive that “undoubtedly would have brought down an aircraft,” the official said.