Istanbul: Videos show the extent of the explosion in the city center

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An explosion occurred in central Istanbul on Sunday afternoon.

The explosion is said to show in a video circulating on social networks.

Footage from a surveillance camera is also said to show the moment of the explosion.

At least four people died and at least 38 were injured.

Many rescue workers and police are on duty.

It is still unclear how the explosion happened in the middle of a popular shopping street in the metropolis.

According to Turkish media, people in the city are urged to avoid the area.