Abu Sayyaf 阿布沙耶夫

Abu Sayyaf (/ˌɑːbuː/ /sɑːˌjɔːf/; Arabic:جماعة أبو سياف‎; Jamāʿah Abū Sayyāf, ASG, Filipino:Grupong Abu Sayyaf) is a militant group based in and around Jolo and Basilan islands in the southwestern part of the Philippines, where for more than four decades, Moro groups have been engaged in an insurgency for an independent province in the country. The group is considered very violent, and was responsible for the Philippines' worst terrorist attack, the bombing of Superferry 14 in 2004, which killed 116 people. The name of the group is derived from the Arabic ابو, abu ("father of") and sayyaf ("swordsmith"). As of 2012, the group was estimated to have between 200 and 400 members, down from 1250 in 2000. They use mostly improvised explosive devices, mortars, and automatic rifles.