Iran delayed the start of negotiations over a permanent peace deal with the US after fighting intensified in southern Lebanon, a potential setback to Donald Trump’s efforts to end the war and curb Tehran’s nuclear program.

The talks, which were meant to take place in Switzerland on Friday, were pushed off because of those clashes between Israel and Iran-backed Hezbollah militants, according to two people familiar with the situation, who asked not to be identified due to the sensitivity of the matter.