TURKEY’S main opposition party retained its control over key cities and made huge gains elsewhere in Sunday’s local elections, according to official results.

The outcome of the local elections is a major setback for right-wing President Recep Tayyip Erdogan.

The incumbent Istanbul Mayor Ekrem Imamoglu, of the Republican People’s Party (CHP) looks to have won by a wide margin in Turkey’s largest city and economic hub, according to the Anadolu Agency.