At least four persons including a woman were killed in different areas of the mega city here on Friday, police said. According to details, a dead body with tied up hands and feet of a youth was found near Dar ul Salam Mosque in Buffer zone area which had been shifted to Abbasi Shaheed hospital for post-mortem, while, two persons were killed in firing by some unknown persons in Maripur and Manzoor Colony. Meanwhile, a dead body of a woman was found packed in a bag near playground of Pak Colony. Police registered cases and started investigation.