Officials say Turkish President Recep Tayyip Erdogan is thanking allies and supporters for the passage of a constitutional referendum he backed that greatly expands his powers.
Officials said Erdogan called nationalist allies on Sunday night to congratulate them for the result as vote-counting was continuing, but nearly completed.
With 97 per cent of votes counted Sunday, 51.4 per cent backed the constitutional changes.
Erdogan supporters were celebrating with fireworks in Istanbul as the vote count was winding up.
Erdogan says he is “grateful” to the people who “reflected their will’
However, the vice-chairman of Turkey’s main opposition party says the party will contest 37 per cent of the votes counted.
Republic People’s Party, or CHP, Deputy Chairman Erdal Aksunger predicted that the figure could even increase to 60 per cent.
Aksunger said: “Since this morning, we have determined some 2.5 million problematic votes.”
The country’s pro-Kurdish opposition party, which also opposed the constitutional changes, says it plans to object to two-thirds of the ballots.
The Peoples’ Democratic Party said on its Twitter account: “Our data indicates a manipulation in the range of 3 to 4 per cent.”