He also stabbed three other workers, leaving them with serious injuries
Out of the seven survivors, five were shifted to hospital, Additional IG Motorway Police Dr Aftab Pathan told Dawn news.
He said efforts were being made to retrieve the bodies, while the survivors included the van driver and a child.
The victims could not be identified immediately.
Nooriabad Deputy Superintendent of Police Nazar Deeshak said the van was on its way to Karachi from Hyderabad.
According to Deeshak, the van overturned and caught fire after taking a number of turns and bouncing off the road.
He said the passengers' bodies were completely charred.
Vehicular traffic was suspended on the motorway after the accident.
He also stabbed three other workers, leaving them with serious injuries
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