The man chosen by
al Qaeda's affiliate in
Yemen
to blow up a US-bound airliner was a double agent who infiltrated the
group and volunteered to carry out the suicide attack, US and
Yemeni officials say.
The
agent, who was apparently working with the knowledge of both Saudi
intelligence and the CIA, escaped Yemen with the sophisticated bomb and
delivered it to foreign intelligence authorities, according to reports.
He is now said to be safe in an unidentified country where he is being debriefed.
A senior US official told the
New York Times
that a bomb for the attack was sewn into "custom fit" underwear that
would have been difficult to detect even in a careful pat-down at an
airport.
The FBI is analysing the explosive.
"Initial exploitation indicates that the device is very similar to
IEDs that have been used previously by al Qaeda in the Arabian Peninsula
(
AQAP) in attempted terrorist attacks, including against aircraft and for targeted assassinations," it said in a statement.
"The device never presented a threat to public safety, and the US
Government is working closely with international partners to address
associated concerns with the device."
Officials said it appeared to be an upgrade of the bomb that failed
to detonate on board an airplane over Detroit on Christmas 2009, a
plot which also originated in Yemen.
This new bomb contained no metal and used a chemical - lead azide -
that was to be a detonator in the plot to attack cargo planes which
nearly succeeded in 2010, officials said.
The New York Times said it had been designed by "the group's top
explosives experts" to be undetectable by airport screening measures,
particularly metal detectors.
A Department of Homeland Security official said that because the
device was similar to the one in the failed 2009 attempt, security steps
taken since "would have been able to prevent this device from bringing
down an airplane".
Experts suggested airport body scanners, which use light doses of
radiation to scan through a passenger's clothes, may have been able to
detect an "anomaly" such as the device, which could then be further
examined in a hands-on, pat down search.
However, the scanners have not been deployed in all airports across the US and are in very limited use elsewhere.
AQAP's master bomb-maker has previously been identified as Ibrahim Hassan al Asiri, a Saudi fugitive.
"I'm convinced that Asiri is behind this. He is an evil genius when
it comes to bomb-making," House of Representatives homeland security
committee chairman Peter King said on Fox News.