DUBAI—Saudi air defenses shot down ballistic missiles fired at the country’s cash and a town along its southern border with Yemen, according to Saudi officers, who blamed Iran-backed Houthi forces in Yemen.

Citizens in Riyadh heard loud booms late Saturday night as Saudi defenses intercepted at minimum one ballistic missile, the officers said. Saudi defenses also shot down at minimum one missile fired at Jizan, a Saudi town near Yemen, they additional.