QUETTA - A security man was shot dead in the provincial capital while unidentified miscreants torched an oil tanker in Mastung Tuesday. Unidentified armed assailants opened indiscriminate fire on Balochistan Constabulary (BC) constable Bahram Khan Jattak on Sariab Road near Tariq Hospital, injuring him critically. He was shifted to hospital where he succumbed to injuries. The deceased was a resident of Dera Murad Jamali. Police say investigation into the killing is underway. However, the motive behind the killing is to be ascertained yet. Meanwhile, unidentified people opened fire on an oil tanker of an oil company on National Highway in Mastung, some 50 kilometres away from Quetta.