Two U.S. Navy pilots were shot down Sunday over the Red Sea in what appeared to be “friendly fire”, the U.S. military said.

The pilots were found alive after they ejected from their aircraft, with one suffering minor injuries.

The incident demonstrates the pervasive dangers in the Red Sea corridor amid ongoing attacks on shipping by the Iranian-backed Houthis, even as U.S. and European military coalitions patrol the area.

The U.S. military had conducted airstrikes targeting Yemen’s Houthi rebels at the time, but the U.S. military’s Central Command did not elaborate on what their mission was.

The military said the aircraft shot down was a two-seat F/A-18 Super Hornet fighter jet assigned to the “Red Rippers” of Strike Fighter Squadron 11 out of Naval Air Station Oceana, Virginia.

The F/A-18 shot down had just flown off the deck of the USS Harry S. Truman aircraft carrier, according to Central Command. On Dec. 15, Central Command said the Truman had entered the Mideast, but did not specify that the carrier and its battle group were in the Red Sea.

“The guided missile cruiser USS Gettysburg, which is part of the USS Harry S. Truman Carrier Strike Group, mistakenly fired on and hit the F/A-18,” Central Command said in a statement.

The Associated Press contributed to this report.