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Iran has begun producing uranium enriched to 60 percent at its Fordo plant, official media reported Tuesday about the underground facility that reopened three years ago amid the breakdown of its nuclear deal with major powers.

The move was part of Iran's response to the UN nuclear watchdog's adoption last week of a censure motion drafted by Western governments accusing it of non-cooperation.

"Iran has started producing uranium enriched to 60 percent at the Fordo plant for the first time," Iran's ISNA news agency reported.

An atomic bomb requires uranium enriched to 90 percent, so 60 percent is a significant step towards weapons-grade enrichment.

Iran has always denied any ambition to develop an atomic bomb, insisting its nuclear activities are for civilian purposes only.

Under a landmark deal struck in 2015, Iran agreed to mothball the Fordo plant and limit its enrichment of uranium to 3.67 percent, sufficient for most civilian uses, as part of a package of restrictions on its nuclear activities aimed at preventing it covertly developing a nuclear weapon.

In return, major powers agreed to relax sanctions they had imposed over Iran's nuclear programme.

But the deal began falling apart in 2018 when then US president Donald Trump pulled Washington out of the agreement and reimposed crippling economic sanctions.