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.
Major quake hits southern Japan, workers missing after mall blast
A 7.1-magnitude earthquake hit Japan's southern Kumamoto prefecture on Tuesday, knocking out power to thousands of homes, rupturing roads and leaving some trapped and others presumed dead inside a partially collapsed shopping mall.
Trump cites 'good' talks on Iran, reiterates threat to hit targets
US President Donald Trump on Tuesday said there have been good talks with Iran even as he reiterated his threats to target Pickaxe Mountain as well as bridges and power plants if a deal is not made with Tehran.
France braces for fourth major heatwave, Macron calls situation 'severe'
France was bracing for its fourth major heatwave of the year on Tuesday, as soaring temperatures and tinder-dry conditions across the southwest piled pressure on crews battling a giant wildfire in the Bordeaux region.
India's top court orders no coercive action against youth protesters
India's Supreme Court on Tuesday ordered the release of under-18s arrested during the youth protests over exam leaks and said authorities must ensure surveillance footage is preserved after petitioners alleged police brutality against demonstrators.
Trump says US and Tehran having 'good, friendly talks'
President Donald Trump said on Monday that the US was having "good talks" with Iran and there was a chance of a deal over their conflict, but warned US strikes would resume if the negotiations failed to deliver.
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