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June 19 (UPI) — Scheduled talks to implement the U.S.-Iran memorandum aimed at de-escalating their war have been postponed, Switzerland said Friday, hours before the meeting was to be held.

Bern’s Foreign Ministry said the planned talks have been “postponed.” Neither a reason nor a new date was given.

“Switzerland remains ready to facilitate these talks,” it said in a statement. “The relevant preparatory work at Burgenstock is continuing.”

U.S. President Donald Trump signed the memorandum of understanding Wednesday while in Paris.

Though all of its specifics have not been made public, the MOU stipulates certain conditions, such as the United States lifting its naval blockade and Iran permitting commercial passage through the Strait of Hormuz.

The first round of negotiations on the MOU’s implementation was scheduled for the mountaintop resort of Burgenstock for Friday. The location had been proposed by mediators Pakistan and Qatar, as well as the United States and Iran, with Switzerland to act as a facilitator in the process.

The cause for the postponement was not initially clear.

A White House spokesperson told reporters in a statement that Vice President JD Vance would not be departing the United States to attend the Swiss negotiations.

The spokesperson said that plans for the talks had not been finalized and their logistics had “never been simple or predictable.”

“We look forward to beginning technical talks as soon as possible,” the spokesperson said.

This is a breaking story.