Israel and Hezbollah accused each other of violating a fragile truce in Lebanon on Sunday, as Prime Minister Benjamin Netanyahu said the military was intensifying strikes while both sides reported new attacks.

The accusations came as the foes said they carried out fresh attacks in southern Lebanon, with AFP correspondents reporting residents in heavy traffic heading north to flee an Israeli warning and strikes, while Israel's army reported one soldier killed.

Tehran-backed Hezbollah drew Lebanon into the Middle East war on March 2 by firing rockets at Israel to avenge the death of Iran's supreme leader Ali Khamenei in U.S.-Israeli strikes, with Israel responding with strikes and a ground invasion.

But claims that both sides have breached a 10-day cease-fire agreed earlier this month have continued even after U.S. President Donald Trump announced its extension for three weeks on Thursday.

"Hezbollah's violations are, in practice, dismantling the ceasefire," Netanyahu told his weekly cabinet meeting.