KARACHI - Four persons died in separate incidents here on Monday. Unknown vehicle crushed two newly recruited policemen to death at Native Jetty Bridge, within the limits of Jackson Police Station. Police said Muhammad Munir and Syed Shahid Shah were going on a motorcycle when a speedy vehicle hit them. They were recently appointed as constables in the police department and were getting training at the Saeedabad Police Training Centre. A case has been registered against the unknown driver. In another incident within the jurisdiction of Saeedabad Police Station, Asghar Ali, 35, was killed when a stationery and under-repair truck fell on him. Similarly, 25-year-old Jehanzaib died when the wall of his under house fell on him at Baba Bid Shah, within the jurisdiction of Docks Police Station.