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Erdogan the most popular, and divisive, leader in recent Turkish history, said there would be no turning back from where he and the Islamist-rooted AK Party had brought the economy.
"Our people have given us the job of carrying out the presidential and executive posts," he said in a short speech from Istanbul.
"I hope nobody will try to cast a shadow on the results and harm democracy in order to hide their own failure."
Broadcasters had earlier reported that Erdogan had 52.8 percent of the vote, with 95.1 percent of the votes counted in the presidential election.