Hezbollah said on Thursday Israel would pay “the price” for killing 10 people including five children in southern Lebanon, the deadliest day for Lebanese civilians in four months of hostilities across the Lebanese-Israeli border.

An Israeli strike killed seven people in the city of Nabatieh late on Wednesday, including three children, sources in Lebanon said. It followed an earlier attack that killed a woman and her two children in the village of al-Sawana at the border.

“The enemy will pay the price for these crimes,” Hezbollah politician Hassan Fadlallah told Reuters. “The resistance will continue to practice its legitimate right to defend its people.”