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From Saad Saeed, Areeba Shahed, and Steve Holland

ISLAMABAD/WASHINGTON, April 25 (Reuters) - U.S. President Donald Trump on Saturday cancelled a visit by two U.S. envoys to Pakistan, which is mediating efforts to end the war with Iran, dealing a fresh blow to peace prospects after Iran's foreign minister left Islamabad following consultations with only Pakistani officials.

With peace talks failing on Saturday, the office of Israeli Prime Minister Benjamin Netanyahu said he had ordered Israeli forces to "forcefully" attack Hezbollah targets in Lebanon, further testing the three-week-old ceasefire.

Trump told reporters in Florida that he decided to cancel the planned visit of US envoys Steve Wittkopf and Jared Kushner because the talks in Islamabad involved too much travel and expense, and that the latest Iranian peace offer was not good enough for him.

Before boarding Air Force One on Saturday to return to Washington, Trump said Iran had improved its offer to resolve the dispute after he canceled the visit, "but not enough."

Trump also wrote in a social media post that there is "tremendous infighting and confusion" within the Iranian leadership.

He added, "No one knows who is responsible, including themselves. We also have all the paperwork, while they have nothing! If they want to talk, all they have to do is call!!!"

Iranian Foreign Minister Abbas Araqchi had left Islamabad earlier without any indication of a breakthrough in talks with Prime Minister Shahbaz Sharif and other senior officials.

Araghchi later described his visit to Pakistan as "very fruitful," adding in a social media post that he "presented Iran's position on a viable framework for permanently ending the war on Iran. We still need to see if the United States is truly serious about diplomatic efforts."

Iranian media reported that Araqchi traveled to the Omani capital, Muscat, and quoted him as saying that he would meet with high-ranking officials "to discuss and exchange views on bilateral relations and regional developments."

Iran's Mehr news agency said Araqchi is expected to visit Pakistan again after his visit to Oman concludes and before traveling to Russia.

Sharif wrote in a post on X that he spoke with Iranian President Masoud Pezeshkian about the security situation in the region and told him that Pakistan is committed to acting "as an honest and sincere mediator working tirelessly to promote lasting peace and continued stability."

Tehran rules out holding a new round of direct talks with the United States, while an Iranian diplomatic source said that Tehran will not accept "hardline demands" from Washington.

Dead end

Relations between Washington and Tehran have reached a deadlock as Iran largely closes the Strait of Hormuz, through which a fifth of the world's oil and liquefied natural gas shipments normally pass, while the United States continues to curb Iran's oil exports.

The conflict, which is now under a ceasefire, began with US and Israeli airstrikes on Iran on February 28. Tehran has since launched attacks on Israel, US bases, and Gulf states, while the war has driven energy prices to their highest levels in several years, fueling inflation and casting a shadow over global growth prospects.

A statement posted on Araqchi’s official Telegram account said that he “explained Iran’s initial positions regarding the latest developments related to a ceasefire and a complete end to the war imposed on Iran.”

When asked about Tehran's reservations regarding the American positions in the talks, an Iranian diplomatic source in Islamabad told Reuters, "In principle, the Iranian side will not accept hardline demands."

White House spokeswoman Caroline Leavitt said the United States has seen some progress from the Iranian side in the past few days and hopes to achieve more during talks early next week.

She noted that US Vice President J.D. Vance is also prepared to travel to Pakistan.

Vance led a first round of unsuccessful talks with Iran in Islamabad earlier this month.