Mastung: Seven people, including five children and a policeman, were martyred in a bomb blast near a Girls High School in Mastung, Balochistan on Friday morning.Twenty-two people were also injured in the blast. The dead and injured were shifted to Civil Hospital Quetta.Police said, five schoolchildren and a passerby were among the dead, while most of the injured were schoolchildren.Police and Rescue teams rushed to the scene on information and shifted the injured and the dead to the DHQ hospital.Hospital sources said that the policeman and three children were received dead, while three injured succumbed to their wounds during treatment.A police mobile van has been completely destroyed in the blast while several other vehicles and rickshaws have been damaged.Balochistan Chief Minister Mir Sarfraz Bugti expressed his grief on the loss of life in blast pledging the killers would not be spared.