Nobody took responsibility for the attack in Awaran, a district near the epicentre of the 7.7-magnitude temblor that is a stronghold of separatist militants of the Balochistan Liberation Front. The quake killed over 500 people and left tens of thousands homeless.
There was no loss of life or property due to the attack, Dawn News channel reported.
Four army soldiers involved in relief operations were killed on Saturday in nearby Panjgur district in a clash with rebels.
Chief Minister Malik has vowed to remain in the quake-hit areas despite security issues to enforce the proper distribution of aid to affected people.