On Sunday evening, Turkish President Recep Tayyip Erdogan topped the results of the presidential elections, after counting 25 percent of the ballot papers, according to state media.

So far, Erdogan, who has been in power for twenty years, has won 54.3 percent of the vote, compared to 39.8 percent for his rival, Kemal Kilicdaroglu, according to preliminary results reported by the Anatolia news agency.

It appears that the majority of ballots counted so far are in heavily pro-Erdogan areas in northern and eastern Turkey.

Faik Ozturk, a spokesman for Kemal Kilicdaroglu's Republican People's Party, said the opposition's internal census showed a "positive" result.

"We will start giving numbers when the number of open ballot boxes reaches a significant level," he added.

In turn, the opposition mayor of Istanbul, Ekrem Imamoglu, who may be appointed as vice-president if Kilicdaroglu wins, asked citizens not to believe the figures published by the official Turkish news agency Anatolia, and said, "We do not believe (the agency) Anatolia at all."