2016. The three countries formed another agreement on joint air patrols. During the first six months of 2016, Abu Sayyaf made $7.3 million, equivalent to Php 353 million, from ransom payoffs. Beheadings As part of its kidnap-for-ransom operations, the Abu Sayyaf has executed some of their male hostages if ransom demands were not met. The group had previously beheaded Christian civilians and others they consider kafir without demanding ransoms for their release, due to their religious affiliation. Bombings 2004 Superferry 14 Bombing Superferry 14 was a large ferry destroyed by a bomb on February 27, 2004, killing 116 people in the Philippines' worst terrorist attack and the world's deadliest terrorist attack at sea. On that day, the 10,192 ton ferry sailed out of Manila with about 900 passengers and crew on board. A television set filled with 8 lb. (4 kilograms) of TNT had been placed on board. 90 minutes out of port, the bomb exploded. 63 people were killed instantly and 53 were missing and presumed dead. Despite claims from terrorist groups, the blast was initially thought to have been an accident caused by a gas explosion. However, after divers righted the ferry five months after it had sunk, they found evidence of a bomb blast. A man called Redendo Cain Dellosa admitted to planting the bomb for Abu Sayyaf. Six suspects were arrested in connection with the bombing while the masterminds, Khadaffy Janjalani and Abu Sulaiman, were killed. 2016 Davao City bombing On September 2, 2016, an explosion occurred at a night market in Davao City, Philippines killing at least 15 and injuring 70. Shortly before the bombing, Abu Sayyaf made a threat following the intensified military operation against them. Abu Sayyaf spokesperson Abu Rami was reported to claim responsibility. He later denied the report and any involvement, saying a group allied to them; the Daulat Ul-Islamiya were responsible. Although the Abu Sayyaf spokesman denied involvement, the Philippine government blame the group. 2019 Jolo Cathedral bombings On January 27, 2019, two bombs detonated at the Roman Catholic Cathedral of Our Lady of Mount Carmel in Jolo town which is the center of Abu Sayyaf stronghold. The bombings resulting to eighteen people were killed while 82 others were injured, mostly from Philippine Army's 35th Battalion and civilians inside the church. The Philippine military said the Abu Sayyaf under the faction of Ajang-Ajang are responsible which is also echoed by