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’ attacks by striking in Yemen.

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.

Israel said it bombed Houthi targets in Yemen on Sunday, expanding its confrontation with Iran's allies in the region after killing the Hezbollah leader Sayyed Hassan Nasrallah on Friday in an escalating conflict in Lebanon.