The International Atomic Energy Agency (IAEA) determined that samples taken from two locations in Iran last fall contain traces of radioactive material, suggesting evidence of undeclared nuclear activities in Iran. Iran had denied IAEA inspectors access to the two sites for seven months last year. In a report last June, the IAEA listed other areas of concern for nuclear weapons work, including a suspicion that Iran had drilled a uranium metal disk, the presence of nuclear material at a site where Iran also tested high explosives, and an undeclared location where Iran might have converted and processed uranium illicitly.