US President Donald Trump said he has cancelled planned strikes against Iran, hours after threatening more bombings and a desire to "take" oil export hub Kharg Island.

"Based on the fact that discussions with the Islamic Republic of Iran have been brought to the highest level of Iranian leadership and approved, I have, as President of the United States of America, cancelled the scheduled strikes and bombings against Iran this evening," Trump wrote in a post on Truth Social on Thursday.

Trump said "discussions and final points" have been approved by the United States, Israel, Saudi Arabia, UAE, Qatar, Türkiye, Pakistan, Bahrain, Kuwait, Jordan, Egypt, and others.

"The Naval Blockade will remain in full force and effect until this Transaction is finalised — Time and place of the signing to be announced shortly," he said.

Earlier, he had vowed fresh strikes on Iran and promised to take the country's key oil infrastructure.

"The United States will be hitting Iran... VERY HARD TONIGHT," Trump wrote on his Truth Social network earlier on Thursday.

"At some point in the not too distant future, we will be taking Kharg Island, and other oil infrastructure points, and assume total control of their Oil and Gas Markets, much like we have with Venezuela," he added.

Trump gave no details of how the United States would seize Iran's oil terminals, but any such operation would almost certainly require the involvement of US ground troops.

He talked about a possible seizure of Kharg Island earlier in the US-Israeli war on Iran, which began on February 28.

Kharg Island is at the heart of Iran's oil export industry, a lynchpin of the country's battered economy. It sits off Iran's Gulf coast, hundreds of kilometres northwest of the narrow, strategic Strait of Hormuz.

US-Iran talks still on track

Earlier, CNN, citing a diplomatic source, reported that talks to reach a deal between the US and Iran are on track despite a recent exchange of strikes.

Exchange of attacks between the US and Iran continued for a second consecutive day, with US President Donald Trump warning that Washington would launch additional strikes unless Tehran immediately accepts the peace deal.

In a statement, the US Central Command said American forces struck multiple military targets in Iran from late Wednesday into early Thursday, describing the attacks as an act of "self-defence" following the downing of a US helicopter in the Strait of Hormuz.

Trump earlier said Iran had taken too long to negotiate a deal, and would have to pay a price.

The ⁠talks since the April ceasefire, which was mediated by Pakistan, have focused on permanently ending the war that began on February 28, unblocking the Strait of Hormuz, and reaching a consensus on Iran’s nuclear programme.

Separately, A senior Iranian official told CNN that the war would continue unless the US respects Iran’s interests, adding that Tehran would retaliate against any future US attacks.

“Whenever they (US) attack, we respond more severely and more heavily,” said Mohammad Mokhber, adding: “(Trump) must understand that the Islamic Republic will not back down or step back from the entirety of its independence and national interests. And, we will make the aggressors regret it.”

“If they respect Iran’s interests and act accordingly, the war will end. Otherwise, the war will continue,” he said.