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.
Some UK departing flights disrupted by NATS technical issue
Some departing flights at major British airports were disrupted on Tuesday after air traffic control provider NATS experienced a technical issue, with Heathrow, Gatwick, Manchester and Stansted among the airports affected by restrictions and delays.
At least 73 injured after Houthi rebels attack Saudi civilian and energy facilities
At least 73 civilians have been injured after Yemen's Houthi rebels attacked a number of civilian and energy facilities in Saudi Arabia's southern region on Tuesday, state media confirmed.
UK, France and Canada sanction Israeli West Bank settlements
Britain, France and Canada on Tuesday moved to block imports from Israeli settlements in the occupied West Bank, as a wider group of countries signalled further steps to defend the two-state solution amid mounting concern over settlement expansion.
Suspect detained after sabotage attacks on Germany power grid
German police have detained a 48-year-old man suspected of carrying out a series of sabotage attacks on the country's electricity grid, police and prosecutors said on Tuesday.
Nepal rescue focused on workers trapped in three tunnels
Rescuers in Nepal are focusing on three hydropower project tunnels where they believe dozens of workers could be trapped, authorities said on Tuesday, two weeks after a devastating flood killed hundreds and left thousands missing.
Indonesia reopens Jakarta airport, four others after Anak Krakatau ash clears
Indonesia has reopened its main airport in Jakarta and four others that had been closed due to volcanic ash from a series of eruptions at Mount Anak Krakatau, transport minister Dudy Purwagandhi said in a statement on Tuesday.
Russia hits Kyiv after brief pause for US envoys' visit, killing two
Russia pummelled Kyiv with drones and missiles early on Tuesday, resuming its air attacks after a brief halt for the visit of US peace negotiators, killing two people and triggering fires across the Ukrainian capital.
Kenya offers temporary amnesty to undocumented East Africans amid crackdown fears
Kenya's government offered a temporary amnesty to undocumented East African nationals after hundreds of Burundians flocked to their country's embassy in Nairobi on Monday seeking travel documents, fearing a crackdown on small-scale traders from abroad.
Pinoy Expat Corner
Why did they choose mountain biking as their sport? What makes mountain biking different from regular road cycling?
Pinoy Expat Corner
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Pinoy Expat Corner
Why is it important for them to preserve Ilokano culture and traditions even while living far from the Philippines?
