A military helicopter crash in Qatar has killed all seven people on board, including three Turkish nationals, according to Turkey’s Ministry of Defense. The ministry confirmed that one of the victims was a Turkish soldier, while two others were security personnel from the Turkish defense equipment manufacturer Aselsan. The remaining four victims were members of Qatar’s armed forces.

Qatar’s Defense Ministry stated that the helicopter went down early Sunday while performing routine duties due to a mechanical failure. Initially, six bodies were recovered and one person was reported missing. Later, the ministry confirmed that all seven had died and released their names. Turkey said that Qatar is conducting an investigation to determine the exact cause of the crash.

Authorities from both countries have not yet disclosed further details about the investigation or the specific circumstances leading to the mechanical failure.