Supporters of presidential candidate Muhammadu Buhari and his All Progressive Congress party celebrate...
Supporters of presidential candidate Muhammadu Buhari and his All Progressive Congress party celebrate in Maiduguri, March 31, 2015. Buhari congratulated outgoing President Goodluck Jonathan for peacefully relinquishing power on Wednesday, a day after becoming the first politician in Nigeria's history to unseat a sitting leader at the ballot box. Picture taken March 31, 2015. REUTERS/Stringer