The Defense Department confirmed the death of a U.S. Navy Air Crewman from St Louis in the crash of a helicopter during heavy-lift operations in the Middle East.

Senior Chief Aviation Warfare Systems Operator Sean P. Sullivan, 40, of St. Louis, Mo., and Naval Aircrewman (Helicopter) Second Class Joseph P. Fitzmorris, 31, of West Monroe, La., were declared deceased following an extensive search of the wreckage and the surrounding areas of the crash.

The MH-53E Sea Dragon helicopter crashed Thursday about 60 miles southwest of Muscat, Oman. Three other crew members were injured.

Sullivan and Fitzmorris were previously reported missing. According to an announcement, the pair were “declared deceased following an extensive search of the wreckage and the surrounding areas of the crash.”

There was no hostile action in the area at the time of the crash, which is under investigation.