As Iran retaliates, largest US military base in Middle East hit by ballistic missile, Qatar says

The U.S. Embassy in Manama, Bahrain, issued a warning on social media on Monday morning for Americans to "exercise caution and maintain vigilance."

"Drone and missile attacks from Iran continue. The U.S. Embassy has advised U.S. citizens in Bahrain that hotels might be a target for attacks and encourages U.S. citizens to avoid hotels in Manama," it added.

"Terrorist groups and those inspired by such organizations are intent on attacking U.S. citizens abroad," the Embassy said. "Terrorist groups continue plotting possible attacks in Bahrain. Terrorists may attack with little or no warning."

The U.S. Embassy in Kuwait shared a State Department statement on X on Monday urging Americans to avoid the facility amid ongoing Iranian strikes on the Gulf nation.

"There is a continuing threat of missile and UAV attacks over Kuwait," the embassy said. "Do not come to the Embassy. Take cover in your residence on the lowest available floor and away from windows. Do not go outside."

"The U.S. Embassy in Kuwait urges U.S. citizens in Kuwait to shelter in place, review security plans in the event of an attack, and to stay alert in case of additional future attacks. U.S. Embassy personnel are sheltering in place," it added.

The Kuwaiti Defense Ministry said in a statement posted to X on Monday morning that "a number of U.S. warplanes crashed," with the cause as yet unclear and all crew members surviving the incidents.

The "relevant authorities immediately began search and rescue operations, evacuating the crews and transporting them to the hospital to check on their health and provide the necessary medical care," the statement said.

All crew members involved were in a "stable" condition, the ministry said.

"The concerned authorities are following up on the investigations to determine the causes of the incident," the statement said.

Cyprus' President Nikos Christodoulides gave an address on Monday morning detailing the attack by an Iranian Shahed drone on a British air base on Sunday night.

The attack on the Akrotiri base in the southwest of the Mediterranean island caused "minor material damage," Christodoulides said.

"From the very beginning, all the competent services of the Republic have been on alert and in full operational readiness," the president said. "At the same time, I immediately convened the National Security Council to assess the situation, which remains in constant consultation."

"I want to be clear: Our country does not participate in any way and does not intend to be part of any military operation," he added.

The U.K. maintains permanent sovereign base areas in Cyprus, which includes Royal Air Force Akrotiri. The base has traditionally served as a hub for British operations in the Middle East.

-ABC News' Will Gretsky