Inspectors from the UN nuclear agency were expected to visit on Sunday - for the first time in more than two years - the Arak heavy-water reactor in Iran.
Two inspectors from the International Atomic Energy Agency arrived in Tehran on Saturday.
In November, the IAEA signed a cooperation pact with the Islamic Republic granting inspectors from the agency access to two nuclear-related sites of concern to the West - the Arak plant and the Gchine uranium mine.Reuters contributed to this report.
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