QUETTA - Unidentified people shot dead a police constable and injured another in Mastung, some 50 Km southeast of Quetta on Monday. Police officer Abdul Qudoos said that, both police constables were returning to Line after completing their duty when armed men riding a motorcycle opened indiscriminate fire on them and escaped from the scene. Resultantly, one of them namely Eid Muhammad was killed while his colleague Shahnawaz received bullet injuries. He was later shifted to Quetta for medical treatment. However, motive behind the killing is yet to be ascertained. Police have registered a case and started investigation into the killing.