They also recovered loads of weapons from the car, according to officials. They recovered grenades, three kilograms of explosives, a pistol and a one-metre detonating cable from the area.
If one bomb was defused at Liberty Square where the attack took place another was defused at the nearby Firdus car park.
"We have defused a bomb in a white Hyundai and after some time we got information about a suspect car in the Firdus car park. We also defused the bomb there," police bomb disposal unit inspector Abdul Ghafoor told AFP.