Abu Sayyaf (; ; ', ASG; ), officially known by the ISIL as the Islamic State – East Asia Province, is a Jihadist militant and pirate group that follows the Khariji doctrine of Sunni Islam. It is 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 seeking to make Moro Province independent. The group is considered 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 "abu" (); "father of"), and "sayyaf" (; "swordsmith"). As of 2021, the group was estimated to have around 80 members, down from 1,250 in 2000. They use mostly improvised explosive devices, mortars and automatic rifles.