Turkey’s long-standing leader Recep Tayyip Erdogan says unofficial results from the presidential elections show he has won outright in the first round.
Mr Erdogan has 53%, while his closest rival, Muharrem Ince, is on 31%, state media report, with most votes counted.
Mr Erdogan also said the governing alliance of his AK Party had secured a majority in parliament, and the polls were a successful test of democracy.
But the opposition claim that it is too early to announce the outcome.
They say many votes remain uncounted.
Under Turkey’s new constitution, due to come into force after the election, the president will hold considerable power.
Some critics argue the enhanced role will see too much power accumulated in one person’s hands, and that Turkey lacks the checks and balances of other executive presidencies such as France or the United States.