Voters in Guinea are casting their ballots in a controversial election which sees President Alpha Condé, 82, seeking a third term.
The day started with heavy rain but as soon as it stopped, long lines started forming in front of polling stations, BBC reports.
Mr Condé ignored critics to push for a change of constitution that allowed him to extend his stay in office.
His main challenger is Cellou Dalein Diallo, who he has twice defeated.
Ethnic clashes during the campaign have raised fears of nationwide violence if the results are disputed.
The government has closed the borders with some neighbouring countries, citing security reasons.