U.S. looking for upgraded underwear bomb with different type of explosive, TSA says

Ibrahim Hassan al-Asiri constructed the first underwear bomb used in 2009 plot, and two other devices that al Qaeda built into printer cartridges and shipped to the U.S. on cargo planes in 2010. CBS

(CBS/AP) ASPEN, Colo. - U.S. security officials are on the lookout for a new type of explosive, after analysis of an upgraded underwear bomb intercepted by a CIA operation in Yemen.

Transportation Security Administrator John Pistole told an audience at the Aspen Security Forum that the device smuggled out by a double-agent in an operation earlier this year was an upgrade from the underwear bomb carried by Nigerian Umar Farouk Abdulmutallab, to try to bring down a Detroit-bound airliner which was on route from Amsterdam on Christmas 2009. Abdulmutallab was one of the 300 people were on board Northwest Airlines Flight 253. At his trial, he called the underwear bomb a "blessed weapon" to avenge poorly treated Muslims.

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"We found in the Underwear Plot, Part 2...that a different type of explosive had been used than the previous one," Pistole said, "so we have gone back and recalibrated all the equipment and we have been working with our canine to detect this different type of explosive."

The CIA intercepted the device earlier this year, thwarting an ambitious plot by al Qaeda's affiliate in Yemen to destroy a U.S.-bound airliner around the one-year anniversary of the killing of Osama bin Laden. The device was made of the same explosive material PETN that is normally used in al Qaeda bombs, that would not be detected by airport metal detectors. However, an ex-TSA administrator told CBS News that the full body scannerswould have detected the device.

The new model also had a more sophisticated trigger mechanism, an apparent attempt to fix the defective trigger that burned the bomber but failed to ignite the bomb in the Christmas attack.

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