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.
US Gaza aid pier breaks in heavy seas
A US military-built pier off Gaza's coast is being temporarily removed after a part of the structure broke off, the Pentagon said, in the latest blow to efforts to deliver humanitarian aid to Palestinians.
South Korea accuses North of sending 'trash' balloons
South Korea has accused North Korea of sending a large number of balloons across the heavily fortified border between the countries to drop objects that included trash and excrement, calling the act base and dangerous.
US says latest Rafah deaths won't change Israel policy
The Biden administration said on Tuesday it was closely monitoring the probe into a deadly Israeli airstrike it called "tragic", but that the recent deaths in Rafah didn't constitute a major ground operation there that crosses any US red lines.
Israeli forces press Rafah offensive despite global outcry
Israel pounded Rafah with airstrikes and tank fire on Tuesday, pressing its offensive in Gaza's southern city despite international condemnation of an attack that sparked a blaze in a tent camp for the displaced, killing at least 45 people.
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Meet Harnidh Kaur, one of the most youngest followed on social media
