US President Donald Trump has declared a peace deal has been struck with Iran and that the ships of the world should “start your engines”.

Pakistan’s prime minister Shehbaz Sharif announced the breakthrough between the US and Iran on Monday morning (AEST).

He said there would be a signing ceremony in Switzerland on Friday.

“Both ⁠sides have ​declared the immediate and permanent termination of military ⁠operations on ‌all ​fronts, including ​in Lebanon,” Sharif ‌said in a ​post on X.

Tehran did not immediately confirm the agreement.

Trump posted on Truth Social that “the Deal with the Islamic Republic of Iran is now complete”.

“Congratulations to all! I hereby fully authorise the toll free opening of the Strait of Hormuz, and, simultaneously herewith, authorise the immediate removal of the United States Naval blockade,” he wrote.

“Ships of the World, start your engines. Let the oil flow!”

The agreement was struck despite an Israeli strike on Lebanon on Sunday that drew criticism from both Iran and Trump.

The precise terms of the deal are not immediately known.

Multiple sources previously told Reuters that ‌the draft deal would ‌reopen the Strait ⁠of Hormuz, end the US blockade of Iranian ports and extend a ceasefire, ​while leaving Iran’s nuclear program to be addressed during 60 days of additional talks.

Earlier, Trump urged no further attacks by anyone after Israel’s military said it launched strikes on Hezbollah targets in Beirut, potentially complicating efforts to finalise a deal to end the US-Iran war.

Smoke rose over the Lebanese capital, and the Civil Defence said it retrieved three bodies and six wounded people from the rubble.

Iran threatened a military response.

“We are very close to a Deal that will bring peace to the region,” Trump reacted on social media.

“Let’s not blow it!”

Trump later told Fox News he still expected an agreement with Iran to be signed in coming hours. He said he planned to ask Tehran not to respond to Israel’s strikes.

The deal in its current form is a deep disappointment to Israel’s government, which has been sidelined in negotiations led by Pakistan and others.

The last time Israel struck the Beirut suburbs a week ago, it set off the most serious escalation of fighting between Iran and Israel since the tenuous ceasefire took hold on April 7.

Trump, who had said the deal could be signed on Sunday, has pressed Israeli Prime Minister Benjamin Netanyahu to stop hitting Lebanon hard while a deal is near, but Netanyahu has defied him.

Netanyahu’s office said the strikes were in response to Hezbollah attacks on northern Israel.

Israel’s military said Hezbollah launched three projectiles, releasing footage where an audible boom was followed by rising smoke. There was no immediate comment from the Iranian-backed Hezbollah.

“Israel will not tolerate firing into its territory,” Netanyahu and Defence Minister Israel Katz said.

The military later said it was preparing for potential incoming fire.

An Associated Press photographer at the scene in Beirut said a five-story apartment building with shops on the ground floor was struck. The two lowest floors were the most heavily damaged.

Residents of the southern suburbs, many of whom had returned home after weeks of relative calm, could be seen fleeing.

Hezbollah fired missiles into Israel on March 2, two days after the US and Israel attacked Iran, sparking war in the Middle East.

Israeli troops have since pushed their invasion of Lebanon deeper than at any point in over a quarter century.

Iran wants a ceasefire deal to include fighting in Lebanon.

Iran’s parliamentary Speaker Mohammad Bagher Qalibaf, a lead negotiator for Tehran, warned the US on X after Israel’s strikes that “if you lack the will and ability to fulfil your commitments, speaking of continuing the path is not possible”.

“Without a doubt, these crimes will not go unanswered,” said General Mohammad Jafar Asadi, deputy commander of Iran’s Joint Command Headquarters, the official Mizan news agency reported.

Qatari mediators travelled to Tehran on Sunday to finalise the agreement, according to two regional officials.

The officials, who spoke on condition of anonymity, expressed cautious optimism that the US and Iran were finally approaching a deal that could halt hostilities that have killed thousands of people and reopen the Strait of Hormuz, whose closure has thrown world markets into disarray.

Sharif said on Saturday a deal would be signed on Sunday, while Iran’s foreign ministry spokesperson Esmail Baghaei said it could happen soon.

Trump said the Strait of Hormuz would open immediately after the signing.

-with AAP