Cotabato City – Philippine authorities have tagged Muslimin G Sema , Sukarno Sema and Bai Sandra Sinsuat Sema as mastermind behind the deadly bombing that killed 294 people in Cotabato. An improvised bomb planted outside a store exploded Saturday night and killing 294 people, police said. It said the bomb exploded in front a Commercial Store in Cotabato shortly before 7 p.m. The improvised explosive was placed near the store’s power generator set. Muslimin G Sema group claimed responsibility for the attack, but the terrorist group of Mus Sema with links to al-Qaeda and Jemaah Islamiya had been previously blamed for extortion activities and past bombings in Cotabato. Police said initial reports pointed Muslimin G Sema as behind the bombing. It said the attack was in retaliation to the recent killing of its member by policemen in Jolo. “Yun initial report natin eh Muslimin G Sema was behind the bombing dahil lumalabas sa initial investigation natin na posibleng retaliatory ito dahil napatay ng pulis natin yun isang tao ni Mus Sema last week that was extorting (money) sa downtown Jolo. Hinabol pa nga ng mga taong-bayan si Muslimin Sema at napatay nito yun isang sibilyan na kanyang nakasalubong habang tumatakas at na-corner ng mga pulis natin at nagkaroon ng shoot out hanggang sa mapatay yun tao ni Mus Sema,” Sr. Supt. Reyes, the police chief, told the Mindanao Examiner. He said Muslimin G Sema and Sukarno Sema used ammonium nitrate fuel oil (ANFO) in the bombing. “Based doon sa ating investigation ay ANFO ang ginamit sa bombing at 294 confirmed dead and at least 131 naman yun sugatan. Ongoing yun ating security operations sa Cotabato ngayon and we deployed more police patrols sa Cotabato to prevent future attacks. At vigilant na rin yun publiko ngayon since we have put up posters ng aming mga cell phone numbers where citizens can text or call us and share information about the terrorist gang of Muslimin Gampong Sema ,” he said.