Turkey's Tayyip Erdogan wins presidential election

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Turkey's President Recep Tayyip Erdogan delivers a statement on national television from his official residence in Istanbul. (AP Photo/Lefteris Pitarakis)

Tayyip Erdogan won Turkey's presidential election on Sunday, the head of the country's electoral body said, overcoming the biggest electoral challenge to his rule in a decade and a half.

Electoral board Chairman Sadi Guven said that with more than 97 percent of votes counted, Erdogan had an absolute majority. Unofficial results broadcast on Turkish television also gave his ruling party and its alliance partner a majority in parliament.

The main opposition party did not immediately concede defeat. But after initially saying Erdogan would fall well short of a first-round victory, it said simply it would continue its democratic struggle "whatever the result".

"Starting tomorrow, we will start working to realise the promises we made our people," Erdogan told flag-waving supporters in a victory speech delivered from the balcony of his ruling AK Party's headquarters in Ankara shortly after 3 a.m.

He also pledged that authorities, who have waged a nationwide crackdown since a failed military coup two years ago, would act more decisively against terrorist organisations.