After a joint U.S.-Israel attack that killed Iranian Supreme Leader Ayatollah Khamenei, retaliatory attacks on sites across the Middle East have been continuing into the second day.

Airports in Dubai and Abu Dhabi in the UAE as well as Kuwait and Bahrain have all been targeted by Iranian drone attacks. At Zayed International Airport (ABU) in Abu Dhabi, debris from an intercepted drone has caused one death and seven injuries in what airport authorities classified as an “incident” that is now under control.

Amid widespread risk of further attacks, foreign affairs ministries in different countries have put out travel advisories urging their citizens to avoid traveling to the region. The U.S. State Department has elevated its travel advisories for Israel and Bahrain to level three’s “reconsider travel” amid the ongoing risk of drone attacks.

“An ongoing threat of drone and missile attacks”: State Department

“Following the onset of hostilities between the United States and Iran on February 28, there has been an ongoing threat of drone and missile attacks from Iran and significant disruptions to commercial flights,” the U.S. travel advisory for Bahrain now reads.

The State Department has also ordered all non-critical U.S. government workers in the two countries to leave along with their families, in Israel’s case a day before the strike on Feb. 27.

Related: Fairmont hotel in Dubai set aflame after Iranian strike

In the United Arab Emirates, the U.S. Embassy in Abu Dhabi and the U.S. Consulate in Dubai have issued a shelter-in-place notice urging Americans in the cities to “find a secure location within your residence or another safe building […with] a supply of food, water, medications, and other essential items” until “further notice.”

Bahrain International was one of the airports targeted by Iranian drone attacks.

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Travel advisories warn of “onset of hostilities between the United States and Iran”

Bahrain and Qatar are also under similar advisories are under similar advisories “following the onset of hostilities between the United States and Iran.”

Countries such as the United Kingdom, Canada, Australia, Germany, France, and Cyprus, among many others, have all issued similar travel advisories warning their citizens against travel to the UAE, Iraq, Israel, Qatar, Kuwait, Lebanon, Bahrain, and Saudi Arabia.

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“If you are already there, if it is safe to leave, leave,” Australian Home Affairs Minister Tony Burke said in a March 1 statement. “Get out. Don’t delay. As long as there are commercial flights available, you should be getting on them.”

Airlines such as Emirates, Lufthansa, KLM, Delta, United Airlines and Qantas have all suspended their services into and out of Dubai. King Khalid International (RUH) in Saudi Arabia is one of the few airports in the entire Middle Eastern region that remains operational and rerouting passengers through a very limited number of flights as large swaths of the airspace over Iran, the United Arab Emirates, Qatar, Bahrain and Israel remains closed.

But with Dubai International closed since Feb. 28, hundreds of thousands of travelers remain stranded in countries around the world. Italian Defence Minister Guido Crosetto was one of those stranded in Dubai over the weekend while on holiday with his family and is being brought back on a military plane on Sunday.

Related: Which flights are canceled over U.S. strike on Iran