Also this week, drones caused fires on ships at an Egyptian port, and Saudi Arabia said it came under fire from Iran-backed militias in Iraq. A strike by Iran or its allies, if confirmed, would mark a significant widening of the conflict. Saudi Arabia has accused the Iraqi militias of firing drones against its oil facilities over the past days. That route became even more important during the war, as Saudi Arabia used it to bypass the Strait of Hormuz. On Monday, the Houthis said they had launched drones targeting facilities used to transport oil across Saudi Arabia to the Red Sea port of Yanbu.