A man claiming to be the leader of Nigerian Islamist extremist group Boko Haram appeared in a video Wednesday taunting world leaders after military claims that he may have been killed.

"Here is Shekau, Shekau, Shekau, Shekau, original ... I want the whole world to know that I'm alive by the grace of Allah," said the man, who resembled past images of Abubakar Shekau, in a video seen by AFP.

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