Aboard Northwest Airlines Flight 253, Umar Farouk Abdulmutallab attempted to detonate plastic explosives hidden in his underwear.

The attempted bombing of Northwest Airlines Flight 253 occurred on December 25, 2009, aboard an Airbus A330 as it prepared to land at Detroit Metropolitan Airport following a transatlantic flight from Amsterdam. Attributed to the terrorist organization al-Qaeda in the Arabian Peninsula (AQAP), the act was undertaken by 23-year-old Nigerian national Umar Farouk Abdulmutallab using chemical explosives sewn to his underwear. These circumstances, including the date, led to Abdulmutallab being commonly nicknamed either the "Underwear bomber" or "Christmas Day bomber" by American media outlets. If successful, it would have been the worst plane crash in the history of Michigan, surpassing Northwest Airlines Flight 255.

Umar Farouk Abdulmutallab popularly referred to as the "Underwear Bomber" or "Christmas Bomber", is a Nigerian terrorist who attempted to detonate plastic explosives hidden in his underwear while on board Northwest Airlines Flight 253, en route from Amsterdam to Detroit, Michigan, U.S. on 25 December 2009.