Iran offered a plan to reopen the Strait of Hormuz, Tehran said, but within hours reports indicated that US President Donald Trump rejected the proposal.

The waterway is key to the world's oil supply and is central to the conflict between the United States and Iran, which the report described as being at a stalemate after nearly seven months.

New mediation efforts at the United Nations gathering of world leaders in New York this week offered some optimism of progress toward a deal.

Iran's Foreign Minister Abbas Araghchi met for talks on Tuesday with Trump's envoy Steve Witkoff, and had previously set out conditions for ending the war and reopening the shipping channel.

According to the report, Iran said it conveyed to the United States, through Qatar, a concrete seven-day plan, conditioned on the necessary conditions being met. The full terms of the plan and the specific conditions were not detailed in the supplied material, and the basis for the reported rejection was not specified.