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The US president says the blockade of Iranian ports will also continue until Tehran presents a "unified proposal"
The status of the US-Iran talks had been unclear with the current ceasefire previously due to expire this week
Vice President JD Vance did not depart for Islamabad as expected on Tuesday, remaining in Washington, the White House has since told reporters he will now not be going
Iran too had not decided whether to send a delegation to Pakistan for talks with the US, a foreign ministry spokesperson told the BBC
Before Donald Trump's announcement that he would be extending the ceasefire, Iran's foreign ministry told the BBC that Tehran has still not decided whether it will attend a new round of peace talks with the US later this week.
In an interview with the BBC's chief international correspondent Lyse Doucet, spokesman Esmail Baghaei said Iran had gone into the first round of Islamabad talks "with good faith and sense of seriousness, but you have a negotiating party that has shown its lack of seriousness, lack of good faith".
He also pointed to "flip flops, threats of war crimes" by the US, a reference to Trump's series of social media posts and interviews over the past two days where he again threatened to "knock out every single power plant, and every single bridge" if Iran did not accept what he called the US's offer of a "very fair and reasonable deal".
The White House confirmed on Tuesday night that Vice-President JD Vance's trip to Pakistan for a second round of peace talks has been cancelled.
Donald Trump has boasted of regime change in Tehran but is now dealing with what he himself is calling regime fracture.
Now that so many of Iran’s top leaders are dead, the question of who’s in charge there is a real one, making the job of diplomacy that much more difficult. It’s probably a little early to gauge the impact of the president’s latest move, but the immediate signs from Tehran are not positive.
An advisor to the speaker of parliament, and lead negotiator, Mohammad Bagher Ghalibaf, said Trump was buying time for another surprise attack.
A military spokesman repeated a warning that Iran was willing to strike back if that happened.
Here in Islamabad, arrangements remain in place for another round of talks, with parts of the city still sealed off. But hopes of a meeting this week appear, for now, to have faded.
Meanwhile, Iran had yet to decide whether to send a delegation to Pakistan for US talks, a foreign ministry spokesperson told the BBC
Iran’s UN Ambassador Amir Saeid said Tehran had received some signs that the US was ready to end its blockade of Iranian ports, adding that the next round of negotiations would only take place when that happens
In an interview with CNBC, Donald Trump said Iran has "no choice but to send" delegates to Pakistan, adding that he "expects to be bombing" if progress is not made
Then, with no sign of the US delegation was departing for Islamabad, the situation abruptly changed when Trump announced he'd be extending the ceasefire, and continuing the US navy blockade of Iranian ports until Iran's leaders can submit a "unified proposal" and discussions are concluded
Trump said he made the decision at the request of Pakistan, whose prime minister then thanked him for it
The White House confirmed that Vance's trip to Pakistan for peace negotiations has been cancelled
US Treasury Secretary Scott Bessent said extending the US naval blockade would continue "to systematically degrade Tehran’s ability to generate, move, and repatriate funds"
While there have been some social media posts from Iranian officials, there has been no formal response from Tehran