The Iran-backed group, whose leader Israel killed in an air strike on Friday, said its fighters launched a “rocket salvo” at Safed and a smaller location “in defence of Lebanon and its people and in response” to Israeli attacks on cities, villages and civilians.

The strike on power stations and a seaport, which killed four people, was the second known time that Israel has retaliated against the militant group’s attacks by striking in Yemen.

Israel said it bombed Houthi targets in Yemen on Sunday and mounted further airstrikes in Lebanon, expanding its confrontation with Iran's allies in the region two days after killing the Hezbollah leader Sayyed Hassan Nasrallah.