A soldier walks through a burnt building at the headquarters of Michika local government in Michika town, after the Nigerian military recaptured it from Boko Haram, in Adamawa state May 10, 2015. Boko Haram has said it wanted to revive the 19th century caliphate of Usman Dan Fodio, an Islamic scholar who threw off corrupt Hausa kings and established strict Sharia law. (Photo by Akintunde Akinleye/Reuters)
