Supporters of AK Party wave flags in Istanbul, Turkey April 1, 2019. REUTERS/Kemal Aslan

ANKARA (Reuters) - Turkish President Tayyip Erdogan’s AK Party (AKP) has appealed to annul local elections in Istanbul, broadcaster Haberturk said on its website on Friday, after initial results showed the opposition won a narrow victory in the city.

Since Sunday’s vote the AKP has submitted objections to the results, saying they had been impacted by irregularities.

Haberturk, without citing sources, said the AKP office in Istanbul’s Buyukcekmece district had appealed to the provincial electoral office to annul the vote across the city due to what it said was illegal voter registrations in the district.