Between 1991 and 1998, the United Nations Security Council tasked the United Nations Special Commission on Disarmament (UNSCOM) with finding and destroying Iraq's weapons of mass destruction. In 1996, UNSCOM discovered evidence of continued biological weapons research and supervised destruction of the Al Hakam biological weapons production site—allegedly converted to a chicken feed plant, but retaining its barbed wire fences and antiaircraft defenses. In 1998, Scott Ritter, leader of a UNSCOM inspection team, found gaps in the prisoner records of Abu Ghraib when investigating allegations that prisoners had been used to test Anthrax weapons. Asked to explain the missing documents, the Iraqi government charged that Ritter was working for the CIA and refused to cooperate further with UNSCOM.