 The kingdom has fought a yearslong war against the Iranian-backed Houthis, who seized Yemens capital in September 2014. The rebels did not immediately acknowledge the attack, though their Al-Masirah satellite news channel said their forces would make an announcement later in the day about a broad operation in Saudi Arabia. The attack began late Monday, with a brief statement on the state-run Saudi Press Agency suggesting other drones may have slipped passed Saudi air defenses, without elaborating. 