BOKO HARAM: A victim of a bomb blast, which ripped through the UN offices in Abuja, is loaded into an ambulance on August 26, 2011, after a car rammed into the building. The attack drew global attention to Boko Haram, the militant group from northern Nigeria, which claimed responsibility for the attack and a string of later bombings that killed hundreds. As the bombings have grown in frequency in recent months, the Nigerian government and Western security officials have begun to grapple with the exact nature of the threat. (Afolabi Sotunde/Reuters)
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