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Iran is operating about 4,000 uranium enrichment centrifuges and it is installing several thousand more, the state news agency IRNA quoted the deputy foreign minister as saying Friday.

"There are nearly 4,000 centrifuges working in the Natanz enrichment facility... another 3,000 centrifuges are being installed," IRNA quoted Alireza Sheikh Attar as saying in an interview with state television.

In July, President Mahmoud Ahmadinejad said Iran had up to 6,000 centrifuges for uranium enrichment, the process at the heart of Western fears that Tehran is secretly trying to build nuclear weapons.

The International Atomic Energy Agency, which has been probing Iran's nuclear activities for several years, said in May that Tehran was operating 3,500 centrifuges in Natanz, a huge underground complex in central Iran.

Iran is under three sets of UN Security Council sanctions over its refusal to freeze enrichment and risks further sanctions for failing to give a clear response to an incentives package offered by six world powers in return for a halt to the sensitive work.

World powers offered to start pre-negotiations with Iran during which Tehran would add no more uranium-enriching centrifuges and in return face no further sanctions.

Under the enrichment process, low-grade uranium is refined into fuel that can power reactors, or at highly enriched levels, into weapons-grade material.

Iran, a leading OPEC oil produ... >>>