from wikipedia:
Iran is a signatory state of the NPT and has recently (as of 2006) resumed development of a uranium enrichment program. The Iranian government asserts that this enrichment program is a step towards a civilian nuclear energy program, which is allowed under the terms of the NPT. However, the United Nations Security Council passed a resolution ordering Iran to halt its activity.[24] The United States and some members of the European Union have accused Iran of using this program to help covertly develop nuclear weapons, which would be in violation of article II of the NPT. Iran remains under investigation by the International Atomic Energy Agency.
In November 2003 IAEA Director General Mohamed ElBaradei reported that Iran had repeatedly and over an extended period failed to meet with its safeguards obligations, including by failing to declare its uranium enrichment program.[25] After nearly two years of diplomatic efforts led by France, Germany and the UK, in September 2005, the IAEA Board of Governors, acting under Article XII.C of the IAEA Statute, found that these failures constituted non-compliance with the IAEA safeguards agreement, not the NPT itself.[26] The United States contends on this basis that Iran violated Article II as well as Article III of the NPT.
