The party of Turkey’s President Recep Tayyip Erdogan has lost control of the capital, Ankara, in local elections in a setback after 16 years in power.
The opposition is also ahead in the contest for mayor of the largest city, Istanbul, the election commission says.
Nationally, the president’s AKP-led alliance has won more than 51% of the vote in the municipal elections.
But the AKP is challenging the results in the capital and Istanbul – seen as the greatest electoral prize.
The vote, considered a verdict on Mr Erdogan’s rule, has been taking place during an economic downturn.
The currency, the lira, has been losing value recently and the economy went into recession in the last three months of 2018.