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.

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 Israeli Air Force launched its largest attack against the Houthis in Yemen so far, bombing power plants and a seaport. Al-Masirah, the Houthi-run news station, said that at least four people were killed — one port worker and three engineers — and 33 injured.