1: Days earlier , the outfit -- Jund al Khilafa , a splinter group of Al Qaeda in the Islamic Maghreb -- had pledged allegiance to ISIS . 2: Militant group Boko Haram has waged a campaign of terror in mostly northern Nigeria for over a decade . 3: Extremist groups operating in Africa include ISIS , al Qaeda in the Islamic Maghreb , Al Shabaab and Boko Haram .
1: splinter group 2: Militant group 3: Extremist groups