Abu Sayyaf is an Islamist separatist terrorist group based in Isabela City in the southern Philippines. It was founded in the early 1990s by Abdurajak Abubakar Janjalani and has since had multiple leaders. While originally focused on separatism, the group shifted over time to criminal activities like kidnapping for ransom in order to fund its operations. Some of its most notorious attacks include the bombing of a ferry in 2004 that killed over 100 people and the kidnapping of tourists from a Malaysian resort in 2000.