At least four people including three security personnel were reportedly injured in a blast in Quetta's Sariab Road on Wednesday.
The Express Tribune quoted an official source as saying that the injured included three security personnel and a passer-by.
Initial reports suggest that a security forces convoy was the target of the attack.
The injured have been admitted to a nearby hospital.
The blast comes after a recent wave of terror attacks in Pakistan which has claimed more than 100 lives.
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