The framework agreement between the United States and Iran has entered into force with "immediate effect" following its signing, mediator Pakistan said.
Iran would "instantly reopen" the Strait of Hormuz and the US would "immediately" lift its naval blockade of Iranian ports, Pakistani Prime Minister Shehbaz Sharif wrote on X early on Thursday.
Earlier, Iranian Foreign Ministry spokesman Esmail Baghaei and a US official said US President Donald Trump and Iranian President Masoud Pezeshkian had signed the agreement.
Sharif said on X that Pakistan, with the support of fellow mediator Qatar, would host the official ceremony to mark "this landmark event" in Switzerland on Friday and begin technical-level talks.
However, the post was later deleted and a new post by Sharif no longer mentioned Switzerland.
Trump signed the document in the French town of Versailles, where he had been received by French President Emmanuel Macron at the palace following the conclusion of the G7 summit.
A video released by the White House on X showed Trump signing a paper version of the agreement. Those present then applauded and Macron shook Trump's hand.
The Iranian Foreign Ministry spokesman had earlier said, according to state media, that Trump and Pezeshkian had signed the agreement digitally. He said there would be no signing ceremony in Switzerland.
The framework agreement, also described as a memorandum of understanding, had previously been expected to be signed on Friday.
Will the Strait of Hormuz reopen now?
According to US news outlet Axios, citing two people familiar with the matter, the early signing was intended to secure a faster reopening of the Strait of Hormuz.
Iran had largely brought traffic in the strait, a key route for global trade in oil, gas and fertilizer, to a standstill shortly after the war began in late February through threats and attacks on vessels.
The US later imposed a naval blockade on Iranian ports in an effort to cut off Tehran's oil revenues.
After weeks of negotiations, the US and Iran agreed on the framework deal on Sunday. The agreement, announced on Trump's 80th birthday, is intended to lay the groundwork for further talks, including on Tehran's disputed nuclear programme.
Deal calls for end to hostilities 'on all fronts'
The memorandum of understanding aims to bring about the "immediate and permanent termination of military operations on all fronts, including in Lebanon," a senior Trump administration official told journalists on condition of anonymity.
Under the terms of the document, neither side would carry out further military operations against the other after the agreement is signed.
The two parties also commit to "respect each other's sovereignty and territorial integrity and to refrain from interfering in each other's internal affairs."
They further agree to begin negotiations aimed at reaching a final settlement within a maximum of 60 days, although that deadline could be extended by mutual consent.
According to the text, the US naval blockade imposed on Iran would be fully lifted within 30 days of the signing of the framework agreement.
Commercial vessels would be guaranteed safe and toll-free passage through the Strait of Hormuz for 60 days. The US official said Iran was expected to work with Oman and other Gulf states bordering the waterway on a longer-term arrangement to ensure continued free passage.
If the US and Iran succeed in reaching a final settlement, Washington would reduce its military presence in the region to pre-war levels within 30 days of that accord being concluded, the official said.
Trump: Break the deal, face the bombs
Trump has stressed that the agreement remained conditional and threatened renewed military action if Iran failed to comply with its terms.
“It's a memorandum of understanding, and if I don't like it, we'll go back to shooting at them, dropping bombs on their heads. I don't like it if they don't behave. We'll go right back to dropping bombs right smack in the middle of their head,” Trump warned at the G7.
The US and Israel began their attacks on Iran on February 28. They bombed missile positions and command centres in Tehran and across large parts of Iran, and supreme leader ayatollah Ali Khamenei was killed in a targeted strike.
Iran responded with attacks on Israel and on Gulf states hosting US military bases.
A highly fragile ceasefire, which has been broken several times, has been in place since early April. The declared US war aim was to prevent Iran from developing nuclear weapons.
