BÜRGENSTOCK, Switzerland—Iran and the U.S. agreed to a mechanism to halt the fighting between Israel and Hezbollah, mediators said, after tensions flared between negotiating teams Sunday.

Talks entered a second day Monday after getting off to a rocky start the preceding day. The Iranian delegation paused direct talks with the U.S. on Sunday, Iranian state media said, after President Trump threatened in a social-media post to restart attacks on Iran.

The administration has wanted to move talks toward negotiations on Iran’s nuclear program, after earlier striking a deal to halt fighting with Iran for 60 days and open the Strait of Hormuz. But the conflict in Lebanon between Israel and Iran-backed Hezbollah militants has become a major stumbling block as fighting has intensified there.

Officials from Pakistan and Qatar resumed their mediation efforts after the Iranian delegation moved out of the negotiation venue. Early Monday local time, they announced a “de-confliction cell” for the Lebanon conflict and also said a line of communication between Iran and the U.S. had been formed to avoid incidents and enable safe passage for commercial vessels through the Strait of Hormuz.

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