"Some Europeans, who would have celebrated and praised Turkish democracy if Yes had gotten [only] 49 percent, today are in mourning. We are not surprised," wrote Ibrahim Kalin on his official Twitter account.

On Sunday, a majority of Turkish voters cast ballots in favor of 18 constitutional amendments set to, among other things, switch Turkey from a parliamentary system of government to a presidential one.

According to unofficial results, the Yes campaign won with 51.41 percent, while the No votes stood at 48.59 percent. Voter turnout was 85.46 percent.

Anadolu Agency