Agreement between Iran and Oman over the strait, which separates the two countries, is seen as vital to a wider deal to end the war, which began with U.S. and Israeli attacks on Iran on February 28 and led to Tehran establishing a chokehold over the major energy export route.

A US official, who declined to be identified, said on Friday that Washington anticipated an agreement soon between Iran and Oman, so normal oil traffic could resume.

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Iranian Foreign Minister Abbas Araqchi said Iran and Oman were "very close" to an agreement on a new shipping route through the strait, but reopening it would depend on other conditions, including US compensation to Iran.

The secretary of Iran's top national security body, Mohammad Baqer Zolqadr, listed other demands including ending US threats against Iran, stopping aggression against Iran and its Lebanese, Palestinian, Yemeni and Iraqi allies, lifting a blockade and sanctions on Iran and freeing Iranian assets.

Oman condemned what it described as repeated attacks on vessels while transiting the strait, without assigning blame, and said that negotiations with Iran on arrangements for shipping through Hormuz were "positive and constructive".

"Oman stresses the importance of avoiding any actions that could affect these negotiations and the progress achieved in a manner that takes into account the interests of all parties," the foreign ministry said.

Araqchi said the previous shipping traffic separation scheme through the strait was no longer acceptable to Tehran and Iran was discussing a temporary route with Oman while technical and legal issues surrounding a permanent route were resolved.

Iran's President Masoud Pezeshkian, a relative moderate, said he believed now was the best time for an agreement.

"There is cohesion, strength, and unity in the country, and as far as I know, Iran is considered victorious and powerful in this war," Iranian news agencies quoted him as saying.

Iran has reacted to the US attacks by targeting US bases in Gulf states and Jordan as well as striking shipping in the narrow strait, which carried a fifth of the world's oil and gas shipments before the war.

The UAE said on Saturday that Iran had attacked a carrier affiliated with the UAE's state oil company with a missile as it transited the Strait of Hormuz. No injuries were reported in the latest attacks on shipping there.

The UK maritime trade monitor UKMTO said a vessel had caught fire after being hit by an unknown projectile but the fire was put out and there was no reported environmental impact.

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There was no immediate comment from Iranian authorities.

In recent weeks, the Trump administration has repeatedly signaled that a deal to open the strait could be close, only to have Iran deny that talks are under way. It was unclear whether the latest flurry of negotiations would yield a more lasting arrangement.

"Once the deal is announced to restore commercial shipping without impediments, the United States will lift the blockade of Iranian ports," the US official told Reuters on Friday. US actions would be tied to Iran's implementation of its commitments, he said.

US Central Command said on Saturday it had allowed more than 30 ships through for humanitarian aid since the current blockade started. US forces have turned away 53 ships, disabled two vessels and boarded two others, Central Command said in a statement on social media.

Prices of food and other necessities have increased rapidly in Iran since the conflict began in February. At a news conference on Saturday, Pezeshkian blamed the U.S. for causing difficulties in importing basic goods.

He did not mention any blockade exceptions for humanitarian aid.

Iran's Revolutionary Guards, who have targeted the ships, also said on Saturday that reopening the strait depended on Washington accepting Iran's conditions and was not related to the Iran-Oman negotiations.

"Whenever the United States accepts Iran’s conditions, the Strait of Hormuz will certainly be reopened," said Guards spokesperson Hossein Mohebbi, according to Iran's Tasnim news agency.

A proposed deal between Iran and Oman to help end five months of war between Iran and the US would give Tehran control over ships entering the Gulf through the strait, a senior Iranian source and two regional officials told Reuters on Wednesday, one of the biggest concessions yet to Iran.

US officials have repeatedly said they would never agree to Iran controlling access to the world's most important trade route for energy supplies. It was not clear whether they had sought to change the parameters of the deal.

Iran has used the hostilities to justify charging a toll on oil tankers. That, and the firing on ships that attempt to cross the strait without its permission, has badly disrupted global shipments, causing energy prices to surge and fueling inflation.

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