“The suicide bomber was riding a motorbike and hit the truck from behind,” senior police official Abdul Hai Aamir said, AFP reported.
The incident took place at Dhadar, the main town of Kachhi district, some 120 kilometers southeast of Quetta in Baluchistan.
Mehmood Notezai, police chief for Kachhi district, said the police were returning from a week-long cattle show where they had been providing security.
Security forces have been battling a years-long insurgency by Baloch militants demanding what they say is a fairer share of the province’s wealth, as well as attacks by the Pakistani Taliban.