JERUSALEM — Israel and the Iranian-backed Hezbollah militant group agreed Friday to halt the heavy fighting in southern Lebanon that had threatened to unravel an interim agreement between the United States and Iran to end their war, officials said. Neither Israel nor Hezbollah immediately confirmed the truce.

It came after a heavy exchange of fire killed 47 people in Lebanon and four Israeli soldiers.

Hezbollah and Israel went to war shortly after the outbreak of the wider conflict, with Hezbollah firing rockets and drones at civilian communities in northern Israel and Israel seizing large swaths of southern Lebanon.

The interim agreement to end the Iran war has already reopened the Strait of Hormuz, which Iran effectively closed, cutting the global economy off from significant supplies of oil and natural gas. The deal would also relaunch talks on Iran’s nuclear program, the core issue over which Israel and the U.S. began the war on Feb. 28.

But the accord already faces threats, chiefly from Lebanon, with the fighting there leading to a delay in the start of talks planned for Friday in Switzerland. The agreement calls for a halt to military operations in Lebanon and for its sovereignty to be respected. Neither Israel nor Hezbollah is a party to the deal.

Israeli Prime Minister Benjamin Netanyahu has vowed to keep Israeli forces in southern Lebanon until the threat is eliminated. Hezbollah has refused to halt its attacks unless Israel commits to withdrawing from Lebanon, which Iran says is also a condition of the deal.

Firing goes on along Lebanese border

Hours after officials told news organizations about the truce, Israeli artillery fire could still be heard from northern Israel along the Lebanese border, and a large explosion was seen erupting inside Lebanon, according to an AP journalist in northern Israel.

Word of the attempt to halt the fighting came from two regional officials and a U.S. official. The effort was mediated by Qatar, the U.S. and Iran, the regional officials said.

The three officials were not authorized to comment publicly and spoke to The Associated Press on the condition of anonymity.

Fighting between Israel and Hezbollah was supposed to end at 4 p.m. local time, according to a second U.S. official who was not authorized to speak publicly and also spoke on condition of anonymity.

A Hezbollah official said an agreement to stop fighting could be announced soon, but he stopped short of confirming it was in place. The official spoke on condition of anonymity because he was not authorized to discuss the matter publicly.

Netanyahu’s office did not immediately comment. However, Netanyahu posted Friday on X that, on his orders, the Israeli army had “struck powerfully” 150 Hezbollah targets, killing dozens of militants.

Military spokesman Brig. Gen. Effie Defrin said the military has not received different instructions from the government. He said Israeli forces were operating in a “forward defense zone” and would continue doing so.

The Israeli ambassador to the U.S., Yechiel Leiter, posted on X that Israel “remains firmly committed to an immediate ceasefire” if Hezbollah honors the agreement and ceases hostilities.

Iranian officials did not travel as planned to Switzerland, insisting that the fighting in Lebanon must stop before the talks can take place, according to the two regional officials, an Iranian official and a fourth person familiar with the matter who spoke on condition of anonymity to discuss sensitive conversations behind the scenes. U.S. Vice President JD Vance also postponed his trip.

The future talks are supposed to bring about a permanent end to the conflict.