This combo shows Iranian Foreign Minister Abbas Araghchi, left, pictured in Tehran, Iran, Tuesday, Feb. 25, 2025 and Steve Witkoff, right, White House special envoy, pictured in Washington, Wednesday, March 19, 2025. (AP Photos Stringer, Mark Schiefelbein)

DUBAI, United Arab Emirates (AP) — Planned negotiations between Iran and the United States this weekend over Tehran’s rapidly advancing nuclear program have been postponed, Oman announced Thursday.

A message online from Omani Foreign Minister Badr al-Busaidi made the announcement in a post on the social platform X.

“For logistical reasons we are rescheduling the US Iran meeting provisionally planned for Saturday May 3rd,” he wrote. “New dates will be announced when mutually agreed.”

Al-Busaidi, who has mediated the talks through three rounds so far, did not elaborate. Iran and the U.S. did not immediately acknowledge al-Busaidi’s comments.

The talks Saturday were to be held in Rome, which soon will see the Vatican begin the conclave on Wednesday to pick a new pope after the death of Pope Francis. Two other rounds of talks have been held in Muscat, the capital of Oman.

The talks seek to limit Iran’s nuclear program in exchange for the lifting of some of the crushing economic sanctions the U.S. has imposed on the Islamic Republic closing in on a half-century of enmity. The negotiations have been led by Iranian Foreign Minister Abbas Araghchi and U.S. Mideast envoy Steve Witkoff.

U.S. President Donald Trump has repeatedly threatened to unleash airstrikes targeting Iran’s program if a deal isn’t reached. Iranian officials increasingly warn that they could pursue a nuclear weapon with their stockpile of uranium enriched to near weapons-grade levels.

Iran’s 2015 nuclear deal with world powers did limit Tehran’s program. However, Trump unilaterally withdrew from it in 2018, setting in motion years of attacks and tensions. The wider Middle East also remains on edge over the Israel-Hamas war in the Gaza Strip.

Meanwhile, the U.S. continues an airstrike campaign, called “Operation Rough Rider,” that has been targeting Yemen’s Houthi rebels, who long have been backed by Iran.

Saturday’s round of talks also took place as an explosion rocked an Iranian port, killing at least 70 people and injuring more than 1,000 others.