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UPDATE: Iran has developed air defense systems that can use passive infrared sensors rather than radar to target aircraft, a solution that previously proved effective in Yemen when employed by Iranian-supported Houthi rebels, reported Air & Space Forces Magazine.

A U.S. F-35 jet made an emergency landing in the Middle East after being hit by suspected Iranian fire during a mission over Iran, reported CNN.

The jet landed safely and the pilot is stable, but the incident is under investigation.

This would mark the first time Iran has successfully hit a U.S. aircraft—specifically a 5th-generation stealth jet—since the war began.

Capt. Tim Hawkins, a spokesperson for US Central Command, confirmed the emergency landing.

“The aircraft landed safely, and the pilot is in stable condition,” Hawkins added. “This incident is under investigation.”