QUETTA: A passenger bus travelling from Quetta to Naushki was struck by a bomb in the Dringarh area near Mastung early on Monday killing six persons, DawnNews reported.
There were around a 100 people reportedly onboard the bus at the time of the attack.
Levies authorities said that the injured were being shifted to the Bolan Medical Complex in Quetta.
Rescue efforts were facing hinderance as the incident took place at a remote location.
Emergency was declared at hospitals in Quetta and additional medical and non-medical staff were called for.
Levy officials added that patrols took place routinely at the site of the attack as it was a sensitive location.
Security personnel cordoned off the area as investigations began into the blast.
No further details could be received regarding the intensity and make of the bomb or about the conditions of the injured.