The incident took place in Kashmore district, where a police van overturned after one of its wheels burst, the district police said, Xinhua news agency reported.

Police said that the injured policemen have been admitted to a nearby hospital, where the condition of two of them is critical.

An investigation is underway to rule out any possible negligence or wrongdoing in the incident.

Road accidents occur frequently in Pakistan due to poorly maintained roads, violation of road safety rules and careless driving.