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.
31 killed, 40 wounded in Israeli raids on Lebanon
Israeli raids targeting several areas across Lebanon on Tuesday killed 31 people and wounded 40 others, Lebanon's health ministry said, in one of the heaviest days of bombing in weeks.
Israel military says it's killed Hamas' armed commander
Israel's military said in a statement on Wednesday it had attacked and killed Hamas’ new armed wing chief, Mohammed Odeh who it said was appointed just days earlier after Israel killed his predecessor.
Remnants of Assad's chemical weapons programme recovered
Syria's transitional leadership has located remnants of former President Bashar al-Assad's clandestine chemical weapons programme, including raw materials and munitions similar to those used to carry out deadly gas attacks during the country's long-running civil war.
Chemical tank rupture in Washington state causes one death, multiple injuries
A chemical tank imploded and ruptured at a Nippon Dynawave Packaging facility in the US state of Washington on Tuesday, resulting in one death and nine injuries, while nine others remained unaccounted for as of Tuesday night, authorities said.
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