ISTANBUL (AP) —

Turkish President Recep Tayyip Erdogan said an explosion on a major pedestrian thoroughfare in in Istanbul was caused by a “bomb attack.” Six people have died.

Speaking before his departure to the G-20 summit in Indonesia on Sunday, Erdogan said the explosion was a “treacherous attack” and its perpetrators would be punished.

Four people died at the scene and two in the hospital, Erdogan said. Another 53 were wounded, according to information he received from the Istanbul governor.

A video posted online showed flames erupting and a loud bang, as pedestrians turned and ran away.

Other footage showed ambulances, fire trucks and police at the scene. Social media users said shops were shuttered and the avenue closed down.

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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