QUETTA - Two unknown people, who were working as plumber in Mund-Buloo, a boring town along Iranian border, were shot dead here on Friday. The deceased belonged to Rahimyar Khan, Punjab. Unknown persons opened indiscriminate fire on Khalil Ahmed and Mukhtiar Ahmed when they were on their way back to their house. The attackers, however, fled from the scene after committing the crime. Meanwhile, unidentified people hurled a hand grenade on Sariab Police Station, Quetta.