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A screengrab taken on September 25, 2013 from a video distributed through an intermediary to local reporters and seen by AFP, shows a man claiming to be the leader of Nigerian Islamist extremist group Boko Haram Abubakar Shekau. The video, which comes after an outburst of violence in northeastern Nigeria, shows the man taunting world leaders after the military said he may have been killed. RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / BOKO HARAM" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS-/AFP/Getty Images
A screengrab taken on September 25, 2013 from a video distributed through an intermediary to local reporters and seen by AFP, shows a man claiming to be the leader of Nigerian Islamist extremist group Boko Haram Abubakar Shekau. The video, which comes after an outburst of violence in northeastern Nigeria, shows the man taunting world leaders after the military said he may have been killed. RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / BOKO HARAM" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS-/AFP/Getty Images

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Analysis: Boko Haram poses wider threat

Terrorist group Boko Haram has been called Nigeria's Taliban. Just how dangerous are they?

Analysis: Boko Haram poses wider threat

Terrorist group Boko Haram has been called Nigeria's Taliban. Just how dangerous are they?