A senior police official Raja Umar Khattab said explosive material was used in the blast but the exact type, the intensity of the blast, and possible targets were still unknown. Khattab added the police would share further information after the bomb disposal squad gave their final review.
The blast took place under the Quaidabad flyover in the eastern part of the city. It was near a crowded area where several vendors set up their makeshift stalls for food and clothes.
Hospital officials confirmed the death toll.
No one has yet claimed responsibility for the explosion.