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.
Afghan nationals carried out two bombings in Pakistan, says minister
Afghan nationals carried out two bombings in Pakistan this week, including one in the capital Islamabad, Pakistan's Interior Minister Mohsin Naqvi told the parliament on Thursday.
Trump signs deal to end longest US government shutdown in history
President Donald Trump has signed a legislation on Wednesday ending the longest government shutdown in US history, bringing federal workers idled by the 43-day shutdown back to their jobs starting as early as Thursday.
Newly released Epstein emails show Trump connection
House Democrats have released emails that they said raised new questions about US President Donald Trump's ties to disgraced financier Jeffrey Epstein and how much he knew about Epstein's offences.
US civil rights leader Jesse Jackson hospitalised
US civil rights leader Jesse Jackson is hospitalised and currently under observation for progressive supranuclear palsy (PSP), the Chicago-based Rainbow PUSH Coalition, which he founded, said.
2 dead, 18 hurt in South Korea after truck crashes into market
A light truck crashed into a market in South Korea on Thursday, ploughing 150 metres along a passageway lined with stalls before coming to a halt, killing two people and injuring 18, according to emergency officials and media reports.
