Shafqat Anwar says the blast occurred on Wednesday in Mastung district, about 50 kilometers (30 miles) south of Quetta, the capital of Baluchistan province. Anwar is the assistant commissioner of Mastung.
No one has claimed responsibility for the attack.
Baluchistan is home to both Islamic militants and separatists who have been waging a low-level insurgency against the government for decades.
On Monday, suspected separatists killed 13 people they abducted from buses in the province, as well as a paramilitary soldier.
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