The mastermind of the 1996 Khobar Towers terrorist attack that killed 19 Americans has been captured, U.S. and Saudi officials said on Aug. 26. The arrest of Ahmed al-Mughassil, who was described by the FBI in 2001 as the leader of the armed wing of the Saudi Hizbullah group, was one of the FBI’s most-wanted terrorists. The arrest concluded a nearly two-decade manhunt.