Iran's Foreign Minister Abbas Araghchi arrived in Oman on Saturday to discuss arrangements for the safe passage of ships through the Strait of Hormuz, with Washington seeking a public pledge of free, secure transit.
US President Donald Trump said on Friday the US and Iran had agreed to continue talks despite an escalation of hostilities this week, while also declaring an end to the ceasefire reached between the two sides.
No attacks were reported on Friday or early Saturday, however, and a senior Iranian source told Reuters a call between Iran, the US, Qatar, and Pakistan had been agreed and mediators were trying to arrange it for Saturday while Araghchi is in Oman.
Oman is helping to mediate an end to a war that has spread insecurity in the Gulf and raised prices around the world since the US and Israel launched airstrikes on Iran on February 28.
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CBS News and its UK partner the BBC both reported that US Vice President JD Vance, Secretary of State Marco Rubio, special envoy Steve Witkoff and Trump's son-in-law Jared Kushner were expected to lead negotiations on Saturday with Araghchi. Iran's Fars news agency later cited a source saying no negotiations would take place until the US retreated from its positions.
Qatari mediators held talks in Tehran on Friday
Three Qatari and Saudi commercial tankers came under fire earlier in the week, prompting the US to hit Iranian sites, and Iran to respond with strikes on US military sites in Gulf states.
Araghchi accused the United States of violating the ceasefire agreement; the US revoked the license authorizing the sale of Iranian crude on Tuesday after the vessels were hit.
"There can only be mutual compliance," he wrote on X.
While Iran has not claimed responsibility for the ship attacks, analysts say Tehran uses such actions to gain leverage in negotiations.
Senior US officials told reporters on Friday that Iran had informed US officials that recent attacks on shipping in the strait were from an "errant part of their system", comments that appeared to be aimed at calming tensions.
The flare-up cast further doubt over the future of an interim agreement aimed at ending the conflict and pushed oil prices higher, a politically sensitive issue for Trump ahead of November congressional elections.
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"The Islamic Republic of Iran has asked us to continue 'talks.' We have agreed to do so, but the United States has stated to them, in no uncertain terms, that the Cease Fire is OVER!" Trump posted on his Truth Social platform on Friday.
Qatari negotiators met officials in Iran on Friday to de-escalate tensions and discuss the Strait of Hormuz, a person with knowledge of the situation told Reuters.
Iran threatens to avenge supreme leader's killing
A written statement from Iran's new supreme leader, Ayatollah Mojtaba Khamenei, on Saturday threatened vengeance for the death of his predecessor and father, who was killed on February 28.
Released to mark funeral ceremonies for former leader Ayatollah Ali Khamenei, which the new leader did not attend, it said the vengeance would take place whatever happened to Iran.
"We pledge to avenge the blood of the martyred leader and all the martyrs," the message said.
Trump had posted on Friday that he had ordered the US military to be prepared to launch thousands of missiles against Iran if Tehran attempted to assassinate him.
Also Read: US imposes fresh sanctions on Iran after Strait of Hormuz attacks
The Wall Street Journal and other US media reported this week that Israel had shared intelligence with Washington that Iran had recently devised a plan to assassinate Trump. There was no immediate comment from Iran on Trump's latest remarks.
At the funeral ceremonies on Thursday, a huge crowd of mourners packed a courtyard, some bearing banners reading, "We Will Kill Trump."
US officials report productive conversations with Iran
Last month's interim deal was meant to pave the way to the end of a conflict now in its fifth month, which has killed thousands, throttled worldwide energy supplies and raised fears of a global economic downturn.
During the war Tehran has largely taken control of the Strait of Hormuz, forcing a stalemate.
The United States is demanding that Iran publicly state it will stop attacks on ships in the strait — and that all lanes will be open with no tolls through the waterway that carried one-fifth of global oil supplies before the war, the senior US officials told reporters on Friday.
Also Read: Iran ready for full-scale defence: Ghalibaf
At least 17 people were killed in US strikes on six cities in Iran on Wednesday and Thursday, the head of the public relations and information center at Iran's Health Ministry said. He said 115 people were wounded.
Even so, US officials said conversations between the two countries had been productive in recent days. Tehran said any breach of commitments by Washington would be met with "reciprocal action".
Renewed fighting in the Gulf has increased the pain for US consumers. After weeks of steady declines, crude oil prices posted their biggest weekly rise in eight weeks.
