Turkey's main opposition party has claimed big election victories in the main cities of Istanbul and Ankara.

The results are a significant blow for Recep Tayyip Erdogan, who had hoped to regain control of the cities less than a year after he claimed a third term as president.

He led the campaign to win in Istanbul, where he grew up and became mayor.

But Ekrem Imamoglu, who first won the city in 2019, scored a second victory for the secular opposition CHP.

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