No one was injured, according to the Qatari Ministry of Defense.
President Donald Trump announced "major combat operations" against Iran on Saturday, with daytime strikes in the joint U.S.-Israel attack targeting military and government sites, officials said.
On Sunday, Iranian state television confirmed that Ayatollah Ali Khamenei was among those killed by airstrikes in Tehran on Saturday.
Iran is responding to the U.S.-Israeli operation with missile and drone attacks targeting Israel, regional U.S. bases and Gulf nations. American diplomatic facilities have also been attacked.
In Lebanon, Israel is intensifying its long-running strike campaign against the Iranian-aligned Hezbollah militia.
Watch special coverage on Nightline, "War with Iran," each night on ABC and streaming on Disney+ and Hulu.
At least 555 people have been killed in the U.S.-Israeli strikes on Iran, the Iranian Red Crescent Society said in a statement on Monday.
Attacks have targeted 131 cities across the country, the statement added.
-ABC News' Somayeh Malekian
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.
