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.
US, Iran begin direct talks in Pakistan, seeking end to six-week war
Senior US and Iranian officials met on Saturday in Islamabad for the highest-level talks between Washington and Tehran in half a century as they sought to bring an end to their six-week war.
Artemis II astronauts safely back on Earth after trip around moon
The Artemis II capsule and its four-member crew streaked through Earth's atmosphere and safely splashed down in the Pacific Ocean on Friday after nearly 10 days in space, capping the first voyage by humans to the vicinity of the moon in over half a century.
Israeli strike kills at least six at Gaza police checkpoint
An airstrike hit a police checkpoint in Bureij camp in the central Gaza Strip early on Saturday, killing at least six people and injuring several others, medics said.
Iran demands Lebanon ceasefire, unfreezing of assets before peace talks
Iran said on Friday that blocked Iranian assets must be released and that a ceasefire must take hold in Lebanon before peace talks can proceed, throwing last-minute doubt over negotiations scheduled for Saturday in Pakistan.
New Zealand authorities order thousands to evacuate ahead of tropical cyclone
New Zealand authorities on Saturday declared a state of emergency in several areas of the North Island and ordered thousands of residents to evacuate their homes in preparation for the arrival of Tropical Cyclone Vaiano, which is expected to reach its peak impact on Sunday.
