"The IAEA inspectors faced no restrictions during their recent visit of Iranian sites," the deputy head of Iran's Atomic Energy Organisation, Mohammad Saeedi, was quoted by the student agency ISNA as saying.

He said the inspectors on Wednesday and Thursday visted the atomic facility in Natanz, 270 kilometers (170 miles) south of Tehran. "The inspectors have completely visited Natanz based on an IAEA request."

Natanz has been a subject of close international attention: Iran only declared the facility to the UN's nuclear watchdog after the site was exposed in 2002 by an exiled opposition group.

Iran says it only intends to produce reactor fuel at Natanz -- which has been at the centre of allegations the country is striving to acquire the capacity to develop an atomic bomb.

Enrichment activities at Natanz have been frozen since late 2003, and Iran has pledged to maintain the suspension pending the outcome of negotiations over its atomic programme with European countries.

The inspectors would visit the nuclear site in Isfahan on Saturday, Saeedi added.

The Isfahan plant is used for uranium conversion, a precursor stage in nuclear enrichment, a process that the EU wants Iran to renounce as it can be used to develop nuclear weapons.