The International Atomic Energy Agency (IAEA) published a report rebuking Iran for denying the agency access to two sites and for failing to answer questions about undeclared material and activities. The IAEA has observed activity that may suggest Iran is trying to sanitize traces of nuclear materials at one of the sites, and Iran has failed to answer the agency’s questions about whether natural uranium was used there. According to two senior diplomats, the sites in question are believed to have been active in the early 2000s. Iran told the agency that it is not obliged to answer allegations regarding past activities.