In 1996, Prabowo led the Mapenduma Operation in the mountainous terrain of Papua, Indonesia. The goal of the operation was the release of 11 scientific researchers, who had been taken hostage by the Free Papua Movement (OPM). The researchers were five Indonesians, four Britons, one Dutchman and his pregnant German wife. Two of the Indonesian male hostages were killed shortly before the rescue operation. The mission involved covert support from British Military Attache and SAS veteran Colonel Ivor Helberg. Following the hostage transfer, Kopassus under Prabowo began a reprisal campaign against villages perceived to support OPM, in one incident at Geselema village attacking the villagers with a military helicopter disguised as a Red Cross helicopter.