An explosion has left people dead and injured at Istiklal Avenue in Istanbul, Turkey.
Istanbul Governor, Ali Yerlikaya, tweeted on Sunday that the explosion occurred at about 4:20 p.m. (1320 GMT), adding that there were deaths and injuries.
The cause of the explosion has yet to be ascertained.
A video posted online showed flames erupting and a loud bang, as pedestrians turned and ran away.
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Other footage showed ambulances, fire trucks, and police at the scene, while social media users said shops were shuttered and the avenue closed down.
A CNN broadcaster, Turk, disclosed that 11 people were injured, saying the avenue was a crowded thoroughfare popular with tourists and locals, lined by shops and restaurants.
Turkey was hit by a string of deadly bombings between 2015 and 2017 by the Islamic State group and outlawed Kurdish groups.
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