Israeli forces opened fire on residents of South Lebanon on Monday as people pressed to return to their homes along the border, a day after at least two dozen people were killed and injured in Israeli attacks, Lebanese officials said.

The Israeli firefight on Sunday was the deadliest violence in Lebanon since the war between Israel and Hezbollah, a Lebanese militia, ended with a ceasefire in November. At least two people were injured in renewed violence on Monday, including a child, according to Lebanon’s health ministry. The Israeli military did not immediately respond to a request for comment.

The Israeli army said Monday it had redeployed to areas of South Lebanon and reiterated calls for Lebanese residents to wait for their approval before returning home. The Lebanese army sent reinforcements to parts of South Lebanon earlier in the day, preparing to enter some towns and protect civilians, Lebanon’s state news agency reported.

Israeli forces killed at least 24 people and injured more than 134 people on Sunday, Lebanese officials said, as thousands of Lebanese marched toward southern towns and villages. Those areas remain occupied by Israel past the 60-day deadline for its withdrawal under the Ceasefire Agreement, which called on both Israel and Hezbollah forces to leave South Lebanon and the Lebanese army and UN peaceably to deploy there in force.

Israel’s military said in a statement on Sunday that it had fired “warning shots” to disperse what it called “riots”. Last week, Israel indicated that it would remain in southern Lebanon despite the deadline, in the middle Doubts about the ability of the Lebanese army to meet Hezbollah’s resurgence.

Negotiators had hoped that by now the US ceasefire would give way to a more permanent settlement. But as the 60-day deadline passed on Sunday, the White House released a statement saying the initial agreement would be extended until February 18. The Lebanese prime minister’s office confirmed the expansion, which they said followed discussions with US officials. The clamor for diplomatic activity appears to be designed to buy time and ward off further violence.

The carnage on Sunday prompted urgent calls for restraint from the UN amid growing fears of a permanent Israeli occupation and renewed hostilities between Israel and Hezbollah. Hezbollah, however, halted its characteristic calls for revenge after the killings.

Battered by its deadliest war with Israel, experts say the group has little incentive to reignite a conflict that would only further weaken the group as it tries to recover. Instead, Hezbollah called on the international community in a statement to “take up its responsibilities” and pressure Israel to “completely withdraw from our lands.”