Two service members ejected above the Red Sea after a warship fired on their aircraft, according to U.S. Central Command. Both sustained minor injuries.

Two U.S. Navy pilots were shot down Sunday over the Red Sea in an apparent “friendly fire” incident, the U.S military said, marking the most serious incident to threaten troops in over a year of America targeting Yemen’s Houthi rebels.

A U.S. Navy ship mistakenly shot down an American fighter jet over the Red Sea early Sunday, the U.S. military said, highlighting the potential risks for international forces as they try to stop attacks on cargo ships by the Houthi militia in Yemen.