Istanbul (IP) - According to initial reports, 4 people lost their lives and 38 were injured in the explosion that took place on Istanbul's Istiklal Street, the governor says.

Iran PressAsia: A deadly explosion rocked Istanbul’s popular pedestrian Istiklal Avenue at about 4:20 pm (13:20 GMT) on Sunday.

Istanbul Governor Ali Yerlikaya tweeted that the wounded are being treated.

The cause of the explosion is still not clear.

“There are strong suspicions that this was a suicide bomb, but we don’t have any official statement yet [on that],” Al Jazeera’s Sinem Koseoglu said from Istanbul.

The avenue is a crowded thoroughfare popular with tourists and locals, lined by shops and restaurants. Social media users said shops were shuttered and the avenue closed down.

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