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.
Homeland Security to send hundreds more officers to Minnesota
The US Department of Homeland Security is sending "hundreds" more officers to Minnesota, Homeland Security Secretary Kristi Noem said, after tens of thousands of people marched through Minneapolis to protest the fatal shooting of a woman by an immigration agent.
India proposes forcing smartphone makers to give source code in security overhaul
India proposes requiring smartphone makers to share source code with the government and make several software changes as part of a raft of security measures, prompting behind-the-scenes opposition from giants like Apple and Samsung.
US military targets IS in Syria strikes
The US military said on Saturday it carried out multiple strikes in Syria targeting ISIS as part of an operation that Washington launched in December after an attack on American personnel.
Israeli fire kills three people in Gaza, tension rises
Israeli fire killed at least three Palestinians in two separate incidents across Gaza, local health authorities said, as tension rises over continued violence.
Tens of thousands protest in Minneapolis over fatal ICE shooting
Tens of thousands of people marched through Minneapolis on Saturday to decry the fatal shooting of a woman by a US immigration agent, part of more than 1,000 rallies planned nationwide over the weekend against the federal government's deportation drive.
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