Earlier, Express News had misreported that the woman had died on the spot, however, she was only injured among the others.
According to Express News correspondent Shahab Salman, the vehicle hit the motorcycle with such a force that it skidded on the road as far as 200 meters.
Salman quoted eye witnesses as saying that the prison van fled the scene after hitting the motorcycle, however, the two escorting vehicles were stopped by an angered mob which set the vehicles alight.
The mob also tried to harm the police officials, but they took refuge in nearby shops.
MA Jinnah Road usually has a huge overturn of traffic between midday to 3pm.
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