On 2 April, 2014, a kidnap gang believed to originate from Abu Sayyaf militants raided Singamata Reef Resort off Semporna. Chinese tourist Gao Huayun from Shanghai and Filipino resort worker Marcy Dayawan were abducted and taken to the Sulu Archipelago. The two hostages were later rescued after a collaboration between Malaysian and Philippines security forces. On 6 May, five Abu Sayyaf gunmen raided a Malaysian fish farm on Baik Island Sabah, kidnapped the fish farm manager and took him to Jolo island. He was freed in July with the help of Malaysian negotiators. On 16 June, two gunmen believed to be from Abu Sayyaf kidnapped a Chinese fish farm manager and one Filipino worker in Kampung Air Sapang. The worker managed to escape and disappeared. Meanwhile, the fish farm manager was taken to Jolo. He was released on 10 December. Malaysian authorities identified five Filipinos, the "Muktadil brothers", as responsible for these cases. They sold their hostages to the Abu Sayyaf group. Of the five Muktadil brothers: Mindas Muktadil was killed by Philippine police in May 2015, Kadafi Muktadil was arrested in late 2015, Nixon Muktadil and Brown Muktadil were killed by the Philippine military on 27 September 2016 after they resisted arrest, while Badong Muktadil succumbed to his injuries while fleeing after he was shot when his brothers was killed. His body was discovered in a pump boat in Mususiasi.
Question: Who took the hostages?
Answer: Abu Sayyaf militants; a kidnap gang