IAEA: Iran has begun enriching uranium gas

Iran has started enriching small amounts of uranium gas at its underground plant, and has already set up more than 1,000 of the machines used in the enrichment process, according to an International Atomic Energy Agency document obtained Wednesday by The Associated Press. The confidential document - a letter to Iranian officials from a senior IAEA staff member - also protests an Iranian decision to prevent agency inspectors to visit the country's heavy water facility that, when built, will produce plutonium. Enriched uranium and plutonium can both be used for the fissile core of nuclear warheads.