A video of Abubakar Shekau, who claims to be the leader of the Nigerian Islamist extremist group Boko Haram, is shown on September 25, 2013. Boko Haram is an <a href='http://www.cnn.com/2014/02/27/world/africa/nigeria-year-of-attacks'>Islamist militant group waging a campaign of violence</a> 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:
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