The Supreme Leader of Iran, Ayatollah Ali Khamenei, along with other clerics, issued a public and categorical religious decree ("fatwa") against the development, production, stockpiling and use of nuclear weapons, though it is approved by some relatively minor clerics. Later versions of this fatwa forbid only the "use" of nuclear weapons, but said nothing about their production. Iran has stated its uranium enrichment program is exclusively for peaceful purposes. The IAEA has confirmed the non-diversion of declared nuclear material in Iran but has also said it "needs to have confidence in the absence of possible military dimensions to Iran’s nuclear program."