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(FILES) — A file screengrab taken from a video released on You Tube on April 12, 2012 apparently shows Boko Haram leader Abubakar Shekau (C) sitting flanked by militants. Boko Haram Islamists on June 18, 2012 claimed suicide attacks on three churches in northern Nigeria’s Kaduna state that killed at least 16 and sparked riots that killed dozens more. AFP PHOTO / YOUTUBE == RESTRICTED TO EDITORIAL USE – MANDATORY CREDIT “AFP PHOTO / YOUTUBE” – NO MARKETING NO ADVERTISING CAMPAIGNS – DISTRIBUTED AS A SERVICE TO CLIENTS ==
