Pakistan's Prime Minister Shehbaz Sharif said on Saturday that a deal was closer "than ever before" and that it would likely be finalised within 24 hours.
Iranian state media reported on Sunday that Tehran has not yet reached a final decision on the proposed peace deal to end the war between the United States and Iran.
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US President Donald Trump and Pakistan, which has acted as a key mediator in the peace talks, had signalled on Saturday that a deal could be reached within the next 24 hours.
"The Deal is scheduled to get signed tomorrow, and immediately after it is signed, the Hormuz Strait is open to all," Trump wrote on his Truth Social account on Saturday.
Pakistan's Prime Minister Shehbaz Sharif had said earlier in the day that a deal was closer "than ever before".
"With finalisation likely expected in the next 24 hours, Pakistan is preparing for the electronic signing of the peace deal immediately after, followed by technical level talks next week," he wrote on X.
A Qatari delegation arrived in the Iranian capital on Sunday as negotiations continued.
The Tasnim news agency said the delegation would "examine the latest developments related to the diplomatic process".
Any deal hinges on Tehran agreeing to fully reopen the Strait of Hormuz, a vital oil and gas transit chokepoint, and to end its nuclear weapons program.
Trump said Saturday that a deal would be a "wall to no nuclear weapon".
"Hopefully, this process will all work out quickly, easily, and smoothly. If it doesn’t, we have the ultimate alternative, hopefully never to be used again," Trump warned.