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In page Khalid Sheikh Mohammed:

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In December 1994, Yousef had engaged in a test of a bomb on Philippine Airlines Flight 434 using only about ten percent of the explosives that were to be used in each of the bombs to be planted on U.S. airliners. The test resulted in the death of a Japanese national on board a flight from the Philippines to Japan. Mohammed conspired with Yousef in the plot until it was uncovered on 6 January 1995. Yousef was captured 7 February of that same year.[citation needed]