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.
Iran names Mojtaba Khamenei as new supreme leader
Iran has named Mojtaba Khamenei to succeed his father, Ayatollah Ali Khamenei, as supreme leader as the week-old US-Israeli war with Iran pushed oil above $100 a barrel.
Trump says he is 'nowhere near' deciding to send troops to Iran
President Donald Trump said on Monday that he was "nowhere near" deciding whether to send U.S. troops into Iran to secure the stockpile of highly enriched uranium there.
Lebanon parliament extends its own mandate for two years as war intensifies
Lebanon’s parliament extended its own mandate for two years on Monday, a statement from the speaker's office said, pushing back elections that were meant to take place in May of this year.
France to deploy almost dozen warships, mulls Hormuz mission, Macron says
France is deploying about a dozen naval vessels, including its aircraft carrier strike group, to the Mediterranean, Red Sea and potentially the Strait of Hormuz as part of defensive support to allies threatened by the conflict in the Middle East.
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