ISIS leader purportedly accepts Boko Haram's pledge of allegiance
By Hamdi Alkhshali and Steve Almasy, CNN
Updated 8:11 PM ET, Thu March 12, 2015
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Photos:Boko Haram: Nigeria's crisis
A video of Abubakar Shekau, who claims to be the leader of the Nigerian Islamist extremist group Boko Haram, is shown in September 2013. Boko Haram is an Islamist militant group waging a campaign of violence in northern Nigeria. The group's ambitions range from the stricter enforcement of Sharia law to the total destruction of the Nigerian state and its government. Click through to see recent bloody incidents in this strife-torn West African nation: