The US has sent Iran a proposal for a nuclear deal between Tehran and Washington, the White House confirmed on Saturday.
Iranian Foreign Minister Abbas Araghchi said he had been presented with "elements of a US deal" by his Omani counterpart Badr Albusaidi during a short visit to the Iranian capital.
It comes after a report by the UN nuclear watchdog said Iran had further stepped up its production of enriched uranium, a key component in the making of nuclear weapons.
White House press secretary Karoline Leavitt said on Saturday it was in Tehran's "best interest to accept" the deal, adding: "President Trump has made it clear that Iran can never obtain a nuclear bomb".
Leavitt said a "detailed and acceptable" proposal had been sent to Iran by US President Donald Trump's special envoy Steve Witkoff.
The US proposal "will be appropriately responded to in line with the principles, national interests and rights of the people of Iran", Araghchi wrote on X.
The precise details of the deal are not yet clear.
The proposal follows a report by the International Atomic Energy Agency (IAEA) – seen by the BBC – which found Iran now possesses over 400kg of uranium enriched to 60% purity – close to the 90% purity required for weapons-grade uranium.
This is well above the level of purity sufficient for civilian nuclear power and research purposes.
It is enough for about 10 nuclear weapons if further refined, making Iran the only non nuclear-armed state producing uranium at this level.
The report paves the way for the US, Britain, France and Germany to push for the IAEA's board of governors to find Iran in violation of its non-proliferation obligations.
Iran insists its programme is peaceful. On Saturday, Iranian state media described the IAEA report as "politically motivated" containing "baseless accusations".
Iran has said it will "implement appropriate measures" in response to any effort to take action against Tehran at the IAEA governors' meeting.
