Iran announces it has closed the Strait of Hormuz, citing Israel’s ongoing attacks in Lebanon, and warns that little progress is likely in upcoming negotiations unless fighting ends. Iran’s move comes as U.S. and Iranian officials travel to Switzerland for talks tied to an interim agreement aimed at halting fighting on multiple fronts. Mediators, including Pakistan and Qatar, say the process starts with technical-level discussions beginning Sunday at the Buergenstock resort, after earlier plans for negotiations. The United States disputes Iran’s claim that it controls the strait, and multiple reports say ship traffic continues under monitoring.

As the talks proceed, mediators say the U.S. and Iran make early progress by agreeing to establish direct communications to reduce risks and help keep the strait open for commercial shipping. Reports also describe a plan and timeline for a roadmap toward a final deal within about 60 days, alongside a mechanism intended to address efforts to end fighting in Lebanon.

A high-level round of talks concludes in Switzerland, but the opening is described as tense, including renewed U.S. threats to resume attacks, according to mediators’ accounts.