Riyadh, Nov. 2 -- The US Embassy in Saudi Arabia has issued a security alert for American citizens, warning of potential attacks on airports, airspace closures and flight disruptions amid escalating hostilities involving Iran-backed Houthi forces and Saudi Arabia.

In its alert issued on Monday (local time), the embassy said the Houthis had engaged in hostilities against the Kingdom, including attacks on civilian airports and other critical infrastructure that had resulted in civilian casualties and severe travel disruptions.

"The hostilities have the potential to escalate rapidly beyond that immediate area," the embassy warned.

The US Department of State had, effective October 23, ordered non-emergency American government employees and...