Security has been tightened in the area to capture the assailants, while the bodies have been shifted to Quetta Civil Hospital.
Security officials inspect the attack site in southwest Pakistan's Quetta on February 14, 2018.
Security forces took the entire area in their cordon and kick-started search operation for the attackers. Last month, at least seven persons were killed on Zarghoon Road in Quetta when a suicide bomber rammed his motorbike into a police truck.
On January 28, a policeman was killed in Quetta's Hazarganji area in a targetted attack while on January 18, two Balochistan Constabulary officials were killed in Quetta.