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.
Israeli strikes kill two in Gaza, destroy medicine storage warehouses
Israel's military on Saturday killed two Palestinians in Gaza and destroyed two warehouses near a hospital that stored medicine in separate strikes, amid uncertainty over whether Israel has accepted a deal reached with Hamas over the group's disarmament.
Restaurant explosion in central Moscow kills three, injures 15
Three people were killed and 15 injured in an explosion that went off near a summer restaurant terrace in central Moscow on Saturday evening, the Russian capital's police force said.
All 10 climbers confirmed killed in Pakistan avalanche
Celebrated Nepali mountaineer Nirmal Purja and nine others were confirmed dead on Saturday after an avalanche on Broad Peak in northern Pakistan.
Russia pounds Kyiv with missiles, killing at least ten
Russia pounded Kyiv and the region in a heavy ballistic missile attack early on Saturday, killing 10 people, as President Volodymyr Zelenskyy warned that Ukraine had run out of interceptor missiles for its US Patriot air defence systems.
UAE President His Highness Sheikh Mohamed bin Zayed Al Nahyan held talks with Ukrainian President Volodymyr Zelenskyy on Sunday, focusing on bilateral cooperation and the latest developments in the Ukraine conflict.
The United Arab Emirates has condemned the Iranian hostile attack targeting Kuwait with drones.
The United Arab Emirates has expressed its condolences to South Africa following a deadly bus crash in the Free State province that killed at least 12 people, including five children, and left dozens more injured.
