At least nine people were killed and five wounded by an Israeli strike on a residential building in Nabatieh city in southern Lebanon, state news agency NNA said on Saturday.
The Israeli military said the airstrike targeted a weapons depot used by Hezbollah.
Tensions have soared in the region in recent weeks, after a deadly rocket strike in the Israeli-occupied Golan Heights that Israel blamed on Hezbollah. Israel responded with the killing of a top Hezbollah commander in the suburbs of Beirut.
Hezbollah has also vowed to retaliate against Israel, as has Iran, for the killing in Tehran of Hamas political chief Ismail Haniyeh.