Iran's exiled opposition movement said Thursday it had learned of two previously unknown sites in and near Tehran that are being used to build nuclear warheads.
"Resistance sources have managed to uncover two centres that work directly on nuclear armaments and which were until now kept secret," Mehdi Abrihamtchi of the People's Mujahedeen told reporters in Paris, where his group is based.
The sites were used for research and the production of nuclear warheads, he said, adding that his organization had passed on the information to the U.N. atomic watchdog, the International Atomic Energy Agency.
Iran has been subjected to three rounds of U.N. sanctions for failing to comply with U.N. resolutions demanding that it halt its uranium enrichment programme which the West sees as a cover for acquiring nuclear arms.
Iran says its nuclear program is solely geared toward electricity generation.