Iran is rapidly expanding its ability to enrich uranium with advanced centrifuges at its underground plant at Natanz and now intends to go further than previously planned, a confidential UN nuclear watchdog report seen by Reuters showed on Monday.

Iran using 'advanced machines' to further expand its nuclear enrichment capabilities: IAEA report

The United States accused Iran on Tuesday of "nuclear extortion" and vowed no let-up in pressure after the clerical regime said it would resume uranium enrichment at the key Fordow plant.

US accuses Iran of 'nuclear extortion' with enrichment step

Iran has started to inject uranium gas into centrifuges at its underground Fordow nuclear facility, state TV reported on Wednesday, further distancing itself from a 2015 nuclear deal between Tehran and world powers that curbed its atomic work.

Iran starts injecting uranium gas into centrifuges at Fordow: State media

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