TYRE, Lebanon (AP) — Iran on Saturday said it closed the Strait of Hormuz because of Israel’s attacks in Lebanon and warned that while negotiators were going to Switzerland for talks with the United States on their interim agreement, not much likely will happen if the fighting doesn’t stop.

U.S. President Donald Trump, in response, threatened to impose American tolls in the crucial waterway if a final deal with Iran isn’t reached in 60 days, saying the money would be for “services rendered as the Guardian Angel to the countries of the Middle East.” His social media post underscored that the agreement calls for toll-free travel for 60 days.

The announcements indicated a rough start to technical-level U.S.-Iran talks that key mediator Pakistan said will begin Sunday, with Qatari mediators also participating.