Iran stopped UN inspectors from visiting an underground bunker where it is building an industrial-scale plant to make enriched uranium but the inspectors will try again, diplomats told AFP Monday.
Iran had promised "frequent inspector access" to the site in Natanz, the UN watchdog International Atomic Energy Agency (IAEA) reported in February.
The highly sensitive inspections, and talks over how they are to take place, came as Iranian President Mahmoud Ahmadinejad was expected to plead Iran's case this week before the UN Security Council, which is considering tightening sanctions on the Islamic republic over fears that it seeks nuclear weapons.
A centre of concern is the uranium enrichment facility at Natanz, in central Iran, where the Iranians are already operating above-ground a pilot plant carrying out research levels of enrichment, the process which makes what can be fuel for civilian nuclear reactors but also the explosive core of atom bombs.
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