Reason why Abdulmutallab suicide mission to blow U.S plane failed

File booking photograph from the U.S. Marshals Service shows Umar Farouk Abdulmutallab

A U.S. official has said that the notorious underwear bomber’s plot in 2009 to blow up a plane on Christmas Day failed because the explosives became ‘degraded’ after he wore the same pair of underpants for two
weeks.
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Nigerian Umar Farouk Abdulmutallab was on a suicide mission
when he attempted to detonate a bomb in his underpants as the
plane, en route from Amsterdam, approached Detroit.
The bomb however failed to detonate aboard the flight, which was
carrying nearly 300 people, but caused a brief fire that caused
burns to his groin.

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He was sentenced to life without parole in February 2012 after he
pleaded guilty to all charges on the second day of his trial the
previous October.

The head of the Transportation Security Administration said this
week the bomb failed to detonate because of how long
Abdulmutallab had been wearing his underwear.

John Pistole told the Aspen Security Forum: ‘The bomber had had
the device with him for over two weeks.’

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Mr Pistole was then asked whether the bomb had become ‘damp’,
to which he replied: ‘Let’s say it was degraded.’
During his trial, Abdulmutallab said the bomb in his underwear
was a ‘blessed weapon’ to avenge poorly treated Muslims around
the world.

After the bomb failed to detonate, passengers pounced
on Abdulmutallab and forced him to the front of Northwest Airlines
Flight 253 where he was held until the plane landed minutes later.