KARACHI: Some unidentified persons riding in a car opened fire and shot dead two police personal , deployed on the security of a doctor, in Khayaban-e-Shahbaz area of Defence Phase-6 area in Karachi on late Wednesday night. According to SSP South, Saqib Ismail Memon, the incident was an outcome of a personal enmity. Talking to Daily Times, he said that some unidentified persons riding in a car opened fire at the policemen who were deployed for the security of a doctor named Abdul Aziz. He added that the brother of the doctor has also been killed in a similar incident earlier. The policemen, identified as Majid, 28, and Ishtiaq, 50, sustained critical injuries and were taken to JPMC . According to Seemin Jamali, in charge Emergency Centre at the Jinnah Hospital, the victims were already dead when they were shifted to the hospital.