Citizens are going to the polls today after a last-minute postponement earlier this week.
The main challenger to reigning president Muhammadu Buhari is former Vice-President Atiku Abubakar.
It is not known exactly when the final results will be announced.
Experts say a winner could be declared as late as Tuesday.
Nigeria is Africa's most populated country.
Trump says deal reached to disarm Hamas, Israeli support for plan remains uncertain
US President Donald Trump said talks in Cairo between mediators and Hamas leaders on Thursday have led to a phased disarmament agreement in Gaza.
Kuwait says Iranian attack hits Chinese company building, kills one
Kuwait's Ministry of Defence said an Iranian attack targeted a building belonging to a Chinese company in the north of the country on Thursday, killing one worker and causing extensive material damage to the facility.
Japan quake snarls auto and chip supply chains as toll hits 34
A powerful earthquake that struck southern Japan this week has exposed the vulnerability of the country's manufacturing supply chains, a decade after a devastating quake in the same region triggered widespread industry disruption.
Indian federal police file charges against 13 over exam paper leaks
India's Central Bureau of Investigation has filed charges against 13 people in connection with leaked question papers for the national medical college entrance test, days after youth-led protests over the scandal forced the education minister to quit.
The UAE has strongly condemned the drone attack targeting two vessels at Damietta Port in Egypt on Wednesday.
Motorists in the United Arab Emirates will be paying more at the pump in August, the UAE Fuel Price Committee confirmed on Friday.
President His Highness Sheikh Mohamed bin Zayed Al Nahyan has directed scholarships for Serbian students to study at UAE universities.
