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Diplomats said on Thursday that the UN's International Atomic Energy Agency (IAEA) is set to report little progress in its attempts to probe allegations that Iran worked on nuclear arms.

Two diplomats quoted by The Associated Press (AP) said the agency's restricted report will likely be released to the UN Security Council and the IAEA's 35 board member nations later in the day. They demanded anonymity because they are not authorized to discuss the report's contents.

Iran agreed a year ago to work with the IAEA. But - like previous probes - the investigation quickly stalled over Tehran insistence that it never wanted or worked on such weapons, the report noted.

The IAEA already indicated back in November that Iran is refusing to answer questions on the military aspects of its program.

Also in November, Iran said it was ready to allow nuclear inspectors access to its Marivan military site, a facility long suspected of being used to develop explosive weapons.

As well as Marivan, IAEA inspectors are also interested in the Parchin military base, where they suspect tests that could be applied to a potential nuclear site have been carried out.

Iran, however, has so far denied access to Parchin.

According to the diplomats cited by AP Thursday, the IAEA also is expected to say that Iran is honoring commitments to put temporary restraints on its atomic activities as it negotiates on a long-term nuclear deal with the U.S. and five other powers. The IAEA has said the same in previous reports it published.