By NBC News
ISIS is expanding into West Africa after it accepted a pledge of allegiance from Boko Haram, the Islamist militant group that has killed and kidnapped thousands of people over more than a decade of terrorizing Nigeria, according to an ISIS audio released Thursday.
In the audio, which was verified by Flashpoint Intelligence, a global security firm and NBC News consultant, a spokesman says ISIS leader Abu Bakr Al-Baghdadi congratulated Boko Haram on joining the radical terrorist movement that controls parts of Syria and Iraq.
Boko Haram, which has been fighting to establish Islamic rule through large-scale bombing and kidnappings, posted its offer online Saturday…
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