Unknown armed motorcyclists on Tuesday killed a policeman in Liaqatabad area. According to police sources, the cop was targeted when he was on the way back to home after duty. The attackers opened indiscriminate firing on him at Liaqatabad No-10 and fled, leaving him fatally injured. Later he succumbed to his injuries on the way to hospital. Police said that that the slain was identified as Syed Zahid Hussain and was presently at Special Security Unit.