A day after a girl student’s body was found in mysterious circumstances in a pond of a farmhouse at Raghunathpur near Nandankanan,Commissionerate police on Saturday said diatom and viscera samples of deceased have been sent for tests to determine exact cause of her death. City DCP Umashankar Dash said samples have been sent to State Forensic Science Laboratory and police are waiting for reports. CCTV footage collected from the spot showed girl entering the farmhouse at around 2 am on Friday. According to sources, girl had left her house at Raghunathpur in a disturbed state as she was allegedly upset over failing to perform well in JEE Main examinations. Though police suspect that the girl committed suicide, her family members have refuted it.