Nigerian militant group Boko Haram has pledged allegiance to ISIS . Audio recording from Boko Haram leader said they would 'obey ' terrorists . Message said group was now loyal to ISIS chief Abu Bakr al-Baghdadi . Merged group now control parts of Syria , Egypt , Libya , Iraq and Nigeria . Four Boko Haram bomb blasts killed 50 people in Nigerian town today .
Nigerian militant group Boko Haram has pledged allegiance to ISIS . Audio recording from Boko Haram leader said they would 'obey ' terrorists . Message said group was now loyal to ISIS chief Abu Bakr al-Baghdadi . Merged group now control parts of Syria , Iraq , Libya , Egypt and Nigeria . Four Boko Haram bomb blasts killed 50 people in Nigerian town today .