The much-awaited autopsy has failed to determine the cause of death of three-year-old Indian boy Gurshan Singh, whose body was found near Melbourne after he went missing from his house. Victoria Deputy Police Commissioner Sir Ken Jones said there is no visible sign of the cause of death and added that the boy's parents were being interrogated. He said police have not yet determined if the boy's death was an opportunistic crime or something else. Gurshan was in Australia on holiday with his family and was due to return to India later this week. His body was found around 30 kilometers away from his residence yesterday. Victorian state police said the toddler's body was found by a council worker in long grass. Australian Prime Minister Kevin Rudd has condemned the toddler's death, calling it a brutal thing to happen. Police were treating the incident as a worst case and have deployed all available resources to investigate the suspected homicide.