Israel struck power plants and a sea port in Yemen Sunday as the Israeli military continued an air campaign against Hezbollah in Lebanon.

The escalation of violence between Israel and its Iran-backed proxies across the Middle East threatened to bring the combatants closer to a regional war.

The Israeli army targeted a power plant and ports in Yemen in revenge for Houthi missile attacks, marking a fresh exchange in another front of the regional conflict. In a statement, the IDF said it had conducted a “large-scale air operation” with dozens of air force aircraft, including fighter jets and intelligence planes.