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The Latest on disputed mayoral elections in Turkey (all times local):

7:35 p.m.

Turkey's state-run news agency says the country's highest electoral body has ruled for a rerun of the Istanbul mayoral election after President Recep Tayyip Erdogan's party challenged the legitimacy of the vote an opposition candidate narrowly won.

Anadolu Agency said the Supreme Electoral Board on Monday ruled in favor of Erdogan's conservative and Islamic-based party and annulled the results of the March 31 local election in Istanbul. It was not immediately clear when the election would be repeated.

In a major setback to Erdogan's 16-year rule, the opposition took control of local governments in the capital of Ankara and Istanbul, ending the ruling party's decades-long control of both cities.

Erdogan's party challenged the results in Istanbul, maintaining that alleged irregularities had affected the outcome.

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4:20 p.m.

Turkey's highest electoral board is meeting to decide whether an opposition politician is the rightful winner of Istanbul's mayoral race — or whether a new election must be held.

Ekrem Imamoglu narrowly won the race for mayor of Istanbul in Turkey's March 31 local elections, defeating ruling party candidate Binali Yildirim, a former prime minister.

President Recep Tayyip Erdogan's ruling party is however, challenging the result, citing alleged irregularities that it insists impacted the result of the vote. It wants the election in the city to be repeated.

The Supreme Electoral Board began its deliberations on Monday. A decision could come later or in the next few days.