The US says Iran must publicly state that the Strait of Hormuz is open and pledge to stop firing on commercial ships.

In a briefing for reporters on Friday, US officials said the message to Tehran had been conveyed through regional mediators.

It comes after incidents earlier this week in which three commercial tankers were attacked, prompting an exchange of strikes with the US. According to US media, Iran told American officials the shootings were a mistake and blamed a rogue internal group.

US President Donald Trump has said the Iranian attacks mean the ceasefire is over, but that talks aimed at ending the war would continue. Iran’s Foreign Minister Abbas Araghchi has accused the US of violating the deal.

The war began with US and Israeli attacks on 28 February, prompting Iran to attack Israel and US targets and allies in the Gulf.

In June, the US and Iran signed a ceasefire agreement where Iran would, in part, give safe passage to commercial ships.

Tehran privately acknowledged to Trump’s advisers that the recent shooting at ships was a mistake, and that an “errant” sect of hardliners was trying to undermine negotiations, senior US officials told CBS News, the BBC’s US partner.

The incident prompted a series of US strikes on around 90 targets across Iran. On Saturday Iran’s Health Ministry said 17 people were killed in the strikes and 115 injured. Iran responded with strikes on US allies in the Gulf.

Meanwhile, a delegation from Qatar travelled to Iran on Friday for talks aimed at defusing tensions and easing navigation through the Strait of Hormuz – the vital waterway where some 20% of the world’s oil and liquefied natural gas passes.

Trump wrote in a post on Truth Social earlier on Friday: “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!”

It is not clear when those talks will be held. Vice-President JD Vance, Secretary of State Marco Rubio, as well as special US envoys Steve Witkoff and Trump’s son-in-law Jared Kushner, are expected to oversee negotiations for the US.

According to Iranian media, Araghchi is in Oman for talks with Omani officials.

A US official said American technical teams would not be present in Oman, but would be in touch with the Omanis and Qataris as developments occurred.

In the early hours of Saturday, Trump also responded to reports that Iran had plans to assassinate him.

The US would “completely decimate and destroy all areas” of the country in retaliation to such an attack, he said.

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 the US president.

However, Trump denied that Tehran had made a fresh plan or that Israel was the source of any intelligence. He told the New York Post in an interview that he had been “No. 1 [on Iran’s kill list] for a long time”.

There were also open calls for Trump’s death at the funeral of Iran’s late Supreme leader Ayatollah Ali Khamenei, who was killed in an Israeli strike on his residence in Tehran on 28 February.

On Saturday, his son and successor, Mojtaba Khamenei, released a written message that said vengeance for his father’s killing was “inevitable”.

The “matter depends neither on my personal existence nor on that of other officials. Whether we are present or not, it will come to pass,” Khamenei said.