Police said that at least 23 people have been killed by armed bandits in Nigeria's northwestern Zamfara state.
Atiku Abubakar’s lawyer said the defeated candidate would challenge the "sham" result as he pledged to do so, after losing against the Nigerian President Muhammadu Buhari.
Elections for governors are being held in 29 of Nigeria's 36 states, for all state assemblies, plus the administrative councils in the Federal Capital Territory of Abuja.
Although voting was peaceful in most areas of Nigeria on Saturday, there were a few outbreaks of violence in the vast West African country and many reports of delays at polling stations.
Nigeria counts votes in closely-fought presidential election even as voting continues in some units where polling opened late or ballot machines malfunctioned.
The incident claimed at least 14 lives, according to a University of Port Harcourt Teaching Hospital spokesman.
From endemic corruption to rising unemployment, here's a breakdown of the issues that matter most in Nigeria's upcoming elections.
With 89 million people living in extreme poverty and unemployment soaring to 23.1 percent, a political opposition to President Muhammadu Buhari is shaping up on the promise of restoring federal governance, which was discarded five decades ago.
The militant group killed at least 60 people in renewed attack in the northeastern town of Rann, Amnesty International said.
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