Published: May 08, 2012 11:06 AM EDT
Updated: May 08, 2012 11:15 AM EDT

They're trying to figure out if it could have slipped past airport security and taken down a commercial airplane.
A covert CIA operation in Yemen recently stopped a suicide mission before the target was selected.
The device is an upgrade of the underwear bomb that failed to detonate on a plane about to land in Detroit Christmas Day 2009.