By Scott Shane and Eric Schmitt, New York Times,  May 8/9, 2012

In an extraordinary intelligence coup, the double agent left Yemen, traveling by way of the United Arab Emirates, and delivered both the innovative bomb designed for his air attack and critical information on the group’s leaders to the C.I.A., Saudi and other foreign intelligence agencies.

After spending weeks at the center of the terrorist network’s most dangerous affiliate, Al Qaeda in the Arabian Peninsula, the agent provided critical information that permitted the C.I.A. to direct the drone strike on Sunday that killed Fahd Mohammed Ahmed al-Quso, the group’s external operations director and a suspect in the bombing of the American destroyer Cole in Yemen in 2000.

He also handed over the bomb, designed by the group’s top explosives expert to be invisible to airport security, to the F.B.I., which is analyzing its properties [....]

Also see:

Double-agent helped CIA foil al-Qaeda plot
By Greg Miller, Washington Post, May 8/9, 2012

Also assisted by its counterparts in Saudi Arabia and Yemen, the U.S. agency tracked the bomb’s movements for weeks, then killed suspected plotters in a drone strike after device was seized....