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.
Netanyahu orders deeper Israeli incursion into Lebanon
Israeli Prime Minister Benjamin Netanyahu said on Sunday he had ordered troops to move further into Lebanon in the battle against Hezbollah, despite a ceasefire announced more than six weeks ago.
Blast in Myanmar village reportedly kills 55 and injures dozens more
At least 55 people were reportedly killed in a blast in Myanmar's Kaung Tat village, which a rebel army said was caused by the accidental explosion of material stored for use in mining.
US military says it turned away blockade runner trying to reach Iranian port
The US military has announced that it fired a missile into the engine room of a vessel trying to get through the US blockade of Iran on Friday.
Two hundred hurt in post-game violence as Paris hails second Champions League triumph
More than 200 people were injured and one person died in Paris following Paris Saint-Germain's second consecutive Champions League win, the interior ministry said on Sunday, reviving France's heated debate about street violence.
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