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Main opposition All Progressives Congress (APC) presidential candidate Mohammadu Buhari (L) holds his ballot paper prior to casting his vote at a polling station in the "Gidan Niyam Sakin Yara A ward" at Daura in Katsina State on March 28, 2015. Voting began in Nigeria's general election but delays were reported countrywide because of technical problems in accrediting electors. AFP PHOTO/PIUS UTOMI EKPEI / AFP / PIUS UTOMI EKPEI (Photo credit should read PIUS UTOMI EKPEI/AFP/Getty Images)

Main opposition All Progressives Congress (APC) presidential candidate Mohammadu Buhari (L) holds his ballot paper prior to casting his vote at a polling station in the "Gidan Niyam Sakin Yara A ward" at Daura in Katsina State on March 28, 2015.   Voting began in Nigeria's general election but delays were reported countrywide because of technical problems in accrediting electors.
 AFP PHOTO/PIUS UTOMI EKPEI / AFP / PIUS UTOMI EKPEI        (Photo credit should read PIUS UTOMI EKPEI/AFP/Getty Images)