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 US 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 January 6 , 1995 . Yousef was captured February 7 of that same year
Philippine Airlines Flight 434
Philippine Airlines Flight 434
Khalid Sheikh Mohammed