Philippine military forces on Friday killed one of the country’s most-wanted Islamist militant leaders and his wife. The pair was blamed for a long series of deadly bombings, killings, extortion, and terror attacks in the provinces of Maguindanao, North Cotabato, and Sultan Kudarat in the southern area of Mindanao for more than a decade, the military said in a statement.

Police forces and Army Special Operations Forces from the Army’s 6ID raided a hideout of the militant group Daulah Islamiya- Hassan Group (DIHG) in a remote area of Talayan town in Maguindanao province and killed its leader, Salahuddin Hassan, and his wife in a 30-minute gunbattle before dawn. Despite more than two dozen other gunmen escaping, Filipino military officials called it a possible death knell for the group.

“With the death of their leader, we are certain that the group will crumble,” said Major General Alfredo Rosario Jr., commander of the military’s Western Mindanao Command. “This is a significant breakthrough in our campaign against terrorism in central Mindanao.”

R4 Assault rifles, ammunition, and rebel documents were seized by troops at the scene of the battle, the military said.