The Iraq War, also known as the Second Gulf War, the Occupation of Iraq, or Operation Iraqi Freedom, is an ongoing military campaign which began on March 20, 2003 with the invasion of Iraq by a multinational force now led by and composed almost entirely of troops from the United States and United Kingdom. Prior to the war, the governments of the U.S., U.K, and Spain claimed that Iraq's alleged possession of weapons of mass destruction (WMD) posed an imminent threat to their security and that of their coalition allies. United Nations weapons inspectors found no evidence of WMD, giving support to earlier criticism of poor intelligence on the subject. After the invasion, the U.S.-led Iraq Survey Group concluded that Iraq had ended its WMD programs in 1991 and had no active programs at the time of the invasion, but that they intended to resume production if the Iraq sanctions were lifted. Although some degraded remnants of misplaced or abandoned chemical weapons from before 1991 werefound, they were not the weapons for which the coalition invaded.