A new report by the United Nations nuclear watchdog shows the agency has made little progress in its investigation into suspicions that Iran has worked to build atomic weapons.
The International Atomic Energy Agency report Friday revealed that Iran has dismissed the allegations about its nuclear program and failed to provide information the IAEA has requested.
The confidential report, obtained by media outlets, also noted continuing construction work at Iran's Parchin military base, where Western officials believe Iran may have conducted explosives tests. Iran has long denied U.N. inspectors access to the base.
The lack of movement in the investigation could hamper the negotiations between Iran and six world powers on a comprehensive agreement that would see Iran curb its nuclear activities in exchange for an easing of economic sanctions.
Western nations have accused Iran of pursuing nuclear weapons capabilities, a charge Tehran has repeatedly denied.
The next round of talks between Iran and the P5+1 is scheduled for later this month. The group consists of the five permanent members of the U.N. Security Council - the United States, Britain, France, China and Russia - plus Germany.