A U.S. Central Intelligence Agency report dated January 2001 speculated that Iran had manufactured and stockpiled chemical weapons – including blister, blood, choking, and probably nerve agents, and the bombs and artillery shells to deliver them. It further claimed that during the first half of 2001, Iran continued to seek production technology, training, expertise, equipment, and chemicals from entities in Russia and China that could be used to help Iran reach its goal of having indigenous nerve agent production capability. However the certainty of this assessment declined and in 2007 the U.S. Defense Intelligence Agency limited its public assessment to just noting that "Iran has a large and growing commercial chemical industry that could be used to support a chemical agent mobilization capability."