Washington and its embassies warn its citizens of a possible escalation in the Middle East

It called on Americans traveling to and from the region to monitor information related to airport operations and airlines, and to check the status of their flights directly with airlines.

The warning came as several US diplomatic missions in the region issued security alerts to Americans, amid regional tensions.

The US Department of State said that Iran-backed Houthis engaged in hostilities against Saudi Arabia, including civilian airports, warning that the military conflict could escalate rapidly.

It also warned that US diplomatic facilities, including those outside the Middle East, had been targeted, and that Iran and its supporting groups might target other US interests abroad or sites linked to the United States and Americans around the world, including US companies and institutions.

The Saudi-led coalition supporting legitimacy in Yemen announced on Saturday evening the interception and destruction of a ballistic missile launched by the Houthis towards Riyadh, where explosions were heard for the first time since the resumption of hostilities.

The Saudi authorities issued the first air raid alert in the capital since the resumption of fighting in Yemen, raising the concern of Riyadh residents after they heard explosions in the early hours of Saturday morning.

US embassies in the region issued a security alert calling on Americans to avoid traveling to military bases, noting that Iran had also attacked civilian and vital infrastructure across the Middle East, including hotels, airports, and other civilian sites.

In the event of an air attack, it recommended staying away from glass doors and windows and any falling debris, monitoring the phone and media for official instructions, keeping phones charged, and saving emergency numbers.

Regarding air traffic, the embassy urged travelers to check directly with airlines or the airport for the status of their flights and to monitor any changes to flights.

The US Department of State and embassies recommended registering with the Department of State's Traveler Enrollment Program (STEP) to receive the latest security updates and facilitate embassy and consulate communication with Americans in emergencies.

Recommendations included being aware of the surroundings, avoiding demonstrations and large gatherings, and areas with heavy police presence, monitoring local media, and following authorities' instructions.

It also recommended exercising caution and remaining vigilant in locations publicly associated with the United States, and maintaining a low profile.