Ankara: At least four people were killed and 20 injured in a suicide bombing that hit Turkey's central Istanbul on Saturday. The attack took place on Balo Street near the Demiroren Mall and one of the killed was the attacker, Hurriyat Daily News quoted IStanbul governor Vasip Sahin as saying. The pedestrian street was sealed off. Police and ambulances were deployed in the area. The attacker was on his way to the actual target when the bomb went off.