Two police officials including an ASI were killed and two injured when a police mobile overturned in district Mastung of Balochistan.According to police sources, a police mobile has turned over due to overspeeding during a routine patrolling in Kank area. ASI Ahmad Nawaz and constable Nobat Khan were killed on the spot whereas SHO City police station Salam Bangalzai and two other policemen sustained injuries in the accident.The injured were shifted to Civil Hospital Quetta.