The Mindanao region is rich in natural resources, including large quantities of mineral reserves. The American colonial government and subsequently the Philippine government pursued a policy of migration by resettling significant numbers of Christian Filipino settlers from the Visayas and Luzon onto tracts of land in Mindanao, beginning in the 1920s. This policy allowed Christian Filipinos to outnumber both the Moro and Lumad populations by the 1970s, which was a contributing factor in aggravating grievances between the Moro and Filipino Christian settlers as disputes over land increased. Another grievance by the Moro people is the extraction of Mindanao's natural resources by the central government whilst many Moros continued to live in poverty. The Philippine government under Ferdinand Marcos encouraged Ilonggo settlers who had emigrated to Mindanao to form a militia, which was eventually called the Ilaga. There is anecdotal evidence that the Ilaga often committed human rights abuses by targeting the Moro and Lumad peoples, as well as attempting to seize additional territory. The end result of Ilaga extremism is the lingering animosity between Moro and Christian communities. Mistrust and a cycle of violence are still felt today due to the creation of the Ilaga.
History
From March 1970 to January 1972, the Ilaga committed 22 massacres resulting in the deaths of hundreds of Muslim civilians. The group is guilty of "mutilat bodies of victims" and "marking bodies with a cross." The group also burned down and looted many houses and properties.
Manili massacre
Violence attributed to the Ilaga reached its climax on June 19, 1971 with the Manili massacre of 70-79 Moro Muslims Civilians in a mosque in Manili, Carmen, North Cotabato. The Muslim residents of the town had gathered in their mosque to participate in a supposed peace talk with Christian groups when a group of armed men dressed in uniforms similar to those worn by members of the Philippine Constabulary opened fire on them.
Following the massacre at Manili, many Maranao Muslims civilians fled to take shelter in the Lanao del Norte. Some Muslims formed small militant groups to counter the Ilaga. One such group was called the "Barracudas" and in September 1971, the Barracudas clashed with the Ilagas resulting in the deaths of hundreds of people on both sides of the conflict. The Ilagas also clashed with the Philippine Constabulary. The skirmishes continued until October, and over 60 Muslim houses were torched by the Ilaga.