The blast is proceeded by firing on Friday afternoon was reported on Mall Road in Chaman .
The bomb had reportedly been fitting in a motorbike.
A law enforcement vehicle, which was the target, along with private vehicles were damaged in the blast, according to police.
At least four persons were injured in the blast including a child and were shifted to the Civil Hospital.
Moreover, public property and several shops were also destroyed as a result of the blast.
Internet services had been blocked an hour before the incident because security agencies had received a threat alert.