Experts seek clues to underwear bomb; World briefs.
USA: FBI experts are picking apart the sophisticated new al Qaida
bomb to discover if it was capable of getting past airport security and
blowing up a commercial plane. The unexploded bomb represents an
intelligence prize, the result of a covert CIA operation in Yemen. The
device did not contain metal, meaning it probably could have passed
through an airport metal detector. But it was not clear whether new body
scanners used in many airports would have detected it. The device is an
upgrade of the underwear bomb that failed to detonate aboard a jetliner
over Detroit on Christmas 2009. This new bomb was also designed to be
used in a passenger's underwear, but this time al Qaida developed a
more refined detonation system.