Officials say an Australian navy sailor has died during shore leave in the Oman port town of Muscat.

The Australian Defense Force on Thursday released few details of the circumstances of the death.

A statement says the sailor was on shore leave in Muscat when he was found unconscious. Despite medical treatment, the sailor could not be revived.

The sailor was a crew member of the guided missile frigate HMAS Darwin which was in Muscat at the time.

The ship is part of international maritime security operations in the Middle East.

Defense officials did not name the sailor or say when the death occurred.