After a bombing killed 19 U.S. airmen at a barracks in Saudi Arabia in 1996, the Clinton administration struck back by unmasking Iranian intelligence officers around the world, significantly disrupting Iranian-backed terrorism, according to a high-level U.S. official and a former top official who was serving at the time of the operation. Undisclosed until now, Operation Sapphire took place in 1997. Though the bombers who struck the Khobar Towers barracks were mostly Saudis, U.S. investigators quickly determined that Iranian intelligence officials had trained and organized the plotters. The former U.S. official said Iran was intimidated enough by the U.S. counterspy operation that it stopped targeting Americans after the bombing. Full Story