Guinea's incumbent President Alpha Conde has won a second term, the National Electoral Commission (CENI) announced Saturday.

The 77-year-old Conde won re-election with nearly 58 percent of the votes cast, reported Deutsche Welle. Conde's nearest opponent, Cellou Dalein Diallo, got nearly 31 percent of the votes.

"Ahead of the definitive confirmation of the results by the Constitutional Court, CENI declares that professor Alpha Conde has won in the first round," commission chief Bakary Fofana said Saturday.

"Conde received nearly 58 per cent of the vote, while his main opponent, Cellou Dalein Diallo, got 31 percent. About 68 percent of the approximately six million registered voters took part in the October 11 election," said Fofana, according to PTI.

Diallo, who pulled out of the contest Wednesday, vowed to protest the "fraudulent and illegal" election.

"I will invite, at the appropriate time, other candidates and all citizens who are the true victims of this electoral hold-up to organize, conforming to the law, peaceful demonstrations to express our indignation and protest against this serious denial of democracy," Diallo said in a statement, according to i24news.

Diallo accused Conde's government and the electoral commission of election fraud, including ballot rigging, but he would not challenge the outcome in the Constitutional Court.

Conde had defeated Diallo in the country's first democratic presidential election held in 2010 after decades of authoritarian rule.