Four people were injured when an explosive device exploded in Khuzdar on Thursday, reported 24NewsHD TV channel.
The blast occurred at a Lazzo link road in which four workers of a private company were injured.
The wounded have been shifted to a nearby hospital for treatment.
According to police sources, the explosive device was fitted to a motorcycle that was parked on the roadside.
A heavy contingent of police later arrived at the blast scene and surrounded the area for a search operation.