Tehran's military central command warned on Sunday that any new US strike would trigger sustained retaliation against American bases and regional interests. Iranian state media reported that the military had intelligence of a planned US operation and asserted that regional allies of Washington would be considered parties to the conflict. Iranian air defenses shot down an Orbiter reconnaissance drone over the Strait of Hormuz on Sunday using domestic systems.

The heightened tension follows a first-time Houthi attack on Riyadh, and Iran has since deployed the majority of its 420,000 troops along its borders on Code 100 alert. President Trump reviewed strike options against the rebels at Camp David on Saturday, while the US Department of State urged citizens to reconsider travel to the region. US government employees in Saudi Arabia now require special authorization for official or personal travel to Taif and Yanbu.