U.S. envoys headed to Pakistan on Saturday to begin a new round of negotiations over the Iran conflict, though Tehran signaled no immediate plans for direct talks.

As Steve Witkoff and Jared Kushner set off for Islamabad, the White House said they would hold an "in-person conversation" with Iranian representatives.

Iran's Foreign Minister Abbas Araghchi arrived in Islamabad on Friday and met Field Marshal Asim Munir, Pakistan's army chief and a key figure in the country's mediation efforts. The pair appeared together in a brief video posted by Tehran's embassy.

Sealing a deal to end the Middle East war remains a thorny proposition, even as urgency mounts to reopen the Strait of Hormuz, a vital conduit for the world's oil and liquefied natural gas (LNG).

White House Press Secretary Karoline Leavitt said Witkoff and Kushner would be in Pakistan "to engage in talks... with representatives from the Iranian delegation".