The Israeli military said Thursday that two of its soldiers were killed in an explosion in southern Lebanon in the first Israeli deaths since the implementation of a shaky truce between Israel and the Iran-backed Lebanese militant group Hezbollah in June.

Four other soldiers were seriously wounded, the military said. The deaths had been reported by Israeli media a day earlier. An Israeli military official, who spoke on condition of anonymity in accordance with the army’s policy, said that “an explosion was detonated” when the soldiers entered a site in the village of Majdal Zoun and that the nature of the explosive was under review.

The Israeli army launched strikes Wednesday in southern Lebanon in response to what it described as Hezbollah’s violation of the ceasefire and issued a call for residents of the village of Mansouri to flee — the first such warning Israel has issued in Lebanon for weeks.

There was no immediate statement from Hezbollah.

The escalation came as Lebanese and Israeli negotiators met in Rome to discuss implementation of a June 26 deal under which Israeli forces are supposed to withdraw from areas they occupy in southern Lebanon and allow the Lebanese army to take control, in exchange for Hezbollah’s disarmament.

Wednesday’s talks ended early due to the escalation on the ground. The talks were set to resume Thursday.

Lebanon’s Health Ministry said one person was killed and 12 wounded in an Israeli strike in the town of Tebnine Wednesday. The state-run National News Agency reported more people wounded in overnight strikes on the village of Burj al-Shemali, but the number was not clear. Artillery shelling also targeted the areas of Mansouri and Majdal Zoun, it said.

The latest Israel-Hezbollah war erupted on March 2, when Hezbollah fired rockets across the border two days after the U.S. and Israel launched their attacks on Iran. More than 4,000 people have been killed by Israeli strikes in Lebanon since then, including hundreds of civilians About 40 soldiers and three civilians — including a military contractor — have been killed on the Israeli side.

A shaky truce between Israel and Hezbollah has largely held since June 20, but Israeli forces have continued to occupy swaths of southern Lebanon and to carry out periodic airstrikes and shelling.

The talks in Rome have focused on implementation of “pilot zones” where Israeli forces would withdraw and the Lebanese army would take control. Implementation began last month with an initial pilot zone in an area that wasn’t occupied by Israeli forces but had previously sustained Israeli fire.

The Lebanese army entered the town of Zawtar al-Gharbieh and some civilians returned, although many came only to find their homes destroyed and left again.

A diplomat familiar with the negotiations who spoke on condition of anonymity because they were not authorized to comment publicly said earlier this week that Lebanon had asked to be either in the town of Khiam or Bint Jbeil. Both areas saw heavy fighting in the latest Israel-Hezbollah war and are currently occupied by Israeli forces.

But U.S. Ambassador to Lebanon Michel Issa suggested ahead of the three-day talks that no new pilot zones would be immediately implemented, saying that “moving too quickly risks jeopardizing the very civilians this process is meant to protect.”