Turkey's Recep Tayyip Erdogan is ahead in the presidential election with a fifth of votes counted, state media report.
Erdogan has 59%, and his closest rival, Muharrem Ince, is on 27%.
If Erdogan wins more than 50% of the overall vote, he will be declared the winner and avoid the need for a second round of voting.
As well as the presidency, voters are also choosing members of parliament. Erdogan's party is ahead in that poll.
His AK Party leads with 55% of the votes counted so far, state media report. The main opposition CHP is on 14%.
Voter turnout is almost 87%, the state broadcaster says.
Turkey remains under a state of emergency imposed in the aftermath of a failed coup in July 2016.
These elections were originally scheduled for November 2019 but were brought forward by Erdogan.
He is seeking a second term as president, and would govern under a new constitution which grants the president new powers.
Erdogan was prime minister for 11 years before becoming president in 2014.