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.
South Korea court jails former first lady for bribery
A South Korean court sentenced former first lady Kim Keon Hee to 20 months in jail on Wednesday for accepting Chanel bags and a diamond pendant from Unification Church officials in return for providing political favours.
Britain's Starmer arrives in China as Western alliances face strain
Keir Starmer began the first visit to China by a British prime minister since 2018 on Wednesday, seeking to strengthen political and business ties with Beijing as relations between Western countries and the US become more volatile.
Indian minister Ajit Pawar dies in plane crash
Deputy Chief Minister of the Indian state of Maharashtra, Ajit Pawar, has died in a plane crash on Wednesday while heading to the city of Baramati to attend public meetings ahead of local body elections next month. He was 66.
Winter storm kills dozens as cold lingers in central and eastern US
At least 38 people across 14 states had died as of Tuesday from a powerful winter storm that left much of the central and eastern US gripped by snow, ice, and below-freezing temperatures, according to local officials and news reports.
India reports two Nipah virus infections as Thai, Malaysia step up screening
India is monitoring Nipah virus infections, with two reported from its eastern state of West Bengal since December, the health ministry said, as some Southeast Asia nations step up scrutiny of air travellers.
