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.
Several people detained in India's Gen Z-led protests against voter roll changes
Indian police detained several people in the capital New Delhi on Saturday, disrupting a second day of protests backed by the Gen Z-led Cockroach Janta Party and other opposition groups against changes to voter rolls.
Saudi Arabia says shrapnel from intercepted ballistic missile in Asir injures one
An Asian expat was injured after shrapnel from an intercepted ballistic missile fell in Ahad Rafidah governorate in the Asir region, Saudi Arabia's state news agency reported.
Israeli strike kills five in Gaza, health officials say
An Israeli airstrike killed at least five Palestinians in an apartment building in Gaza City early on Saturday, health and civil defence service officials said.
Nine injured in Australia as car crashes into crowd north of Sydney
A man appeared to lose control of a car that drove into a crowd in the Australian city of Newcastle on Saturday, injuring nine, authorities said.
India's 'cockroach' youth party to protest, demand poll chief's resignation
Prime Minister Narendra Modi faced renewed pressure on Friday as the Gen Z-led Cockroach Janta Party and a separate coalition of student and activist groups stage fresh protests, demanding the resignation of the elections commission chief over a controversial voter roll revision.
