Saudi Arabia issued repeated alerts in September 2026 primarily concerning security risks in which type of locations?

Explanation: Saudi Arabia issued repeated alerts for its major cities in September 2026 amid the escalating conflict with Iran-backed Houthi forces in Yemen, who have launched drones and missiles at Saudi urban centres as part of the widening regional war. The alerts reflect the kingdom's effort to maintain public vigilance and readiness as attacks that had previously been concentrated near the Yemen border increasingly threatened areas deeper inside Saudi territory, including near the holy city of Mecca.