Ogan: It looks like the presidency will go to a runoff

Sinan Ogan, the nationalist presidential candidate, says he thinks the election will go to a second round, which would be held in two weeks if no one gets over 50 percent.

"We see a high probability that the elections will go to the second round. Turkish nationalists and Kemalists are the key to this election," he said. With around five percent of the vote, Ogan's electorate will likely play kingmakers.

In a tweet, Erdogan said no one should hastily declare results. 

"While the election was held in such a positive and democratic atmosphere and the vote counting is still going on, trying to announce results hastily means usurpation of the national will," he said.

Erdogan also urged his supporters to maintain a presence at the ballot boxes until the results are official.

Kilicdaroglu did the same, calling Erdogan's early large lead a "fiction" and calling on the election board to provide more data.

"Ballot observers and election board officials should never leave their places. We will not sleep tonight, my people," he said.