Iran has said it will allow international inspectors access to its Parchin military complex, according to the ISNA news agency, after the head of the UN nuclear watchdog raised concerns about activities at the site.

The Iranian news agency reported on Tuesday that Iran's diplomatic mission to the International Atomic Energy Agency (IAEA) in Vienna had confirmed that inspectors could visit the site.

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"Parchin is a military site and accessing it is a time-consuming process, therefore visits cannot be allowed frequently ... We will allow the IAEA to visit it one more time," the statement said.

AN IAEA team were denied access to Parchin during high-level talks in Tehran in February. The statement did not set a date for a further visit, while Iranian diplomats and IAEA officials have not commented on the statement.

Yukiya Amano, the head of the IAEA, said on Monday that Iran had tripled its monthly production of higher-grade enriched uranium and expressed "serious concerns" about possible military dimensions to Tehran's atomic activities.

Iran says that it is developing nuclear technology for peaceful civilian purposes.

But an IAEA report last year said that Iran had built a large containment chamber at Parchin, southeast of Tehran, to conduct explosives tests that were "strong indicators" of efforts to develop a nuclear device.

Parchin is a weapons development site owned by Iran's Defence Industries Organisation, a group of state-owned military companies.

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