Revealed: The Flight 253 bomber's explosive underwear

In the second photo (below), the packet of actual explosive powder has been removed from the underpants and displayed separately.

It is a six-inch long packet of the high explosive chemical called PETN, less than a half cup in volume, weighing about 80 grams.

A government test with 50 grams of PETN blew a hole in the side of an airliner. That was the amount in the bomb carried by the so-called shoe bomber Richard Reid over Christmas 2001.