Four police personnel were injured in the attack that took place when the policemen were busy taking an examination and the assailants ambushed the main gate of the Police Lines area in Balochistan's Loralai district.
The blast came days after terrorists attacked the Pearl Continental luxury hotel in the port city of Gwadar in Balochistan, killing at least eight persons, including four civilians and a Pakistan Navy soldier.
Balochistan Chief Minister Jam Kamal Khan Alyani condemned the blast and ordered a report on the incident.
