Nigeria hits the polls

LUIS TATO / AFP

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.

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