On Christmas Day 2009, Umar Farouk Abdulmutallab boarded Northwest Flight 253 with explosives inside his shorts. Fortunately, he was unable to get his makeshift detonator to function. The U.S. Department of Homeland Security (DHS), the Transportation Safety Administration, and various U.S. intelligence agencies did not foresee this type of attack, a problem that former National Intelligence Chief John Negroponte called a failure of imagination.
It has been more than eight years since the attack
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