The victims were first taken to a local hospital before being referred to the government run Sir JJ Hospital, where they succumbed, police said. (File Photo) A final post mortem report submitted by Mumbai’s Sir JJ Hospital on Thursday concluded that poisoning due to zinc phosphide, a toxic chemical commonly used as rat poison , caused the deaths of four members of a family in south Mumbai’s Pydhonie area last month. The report pertains to the deaths of Abdullah Dokadia (40), his wife Nasreen Dokadia (35), and their daughters Ayesha (16) and Zainab (13), who died within hours of consuming watermelon at their residence in Ghari Mohalla on Ismail Kurte Road on the night of April 25. Confirming the latest development, a senior IPS officer said, “The JJ hospital on Thursday submitted the final cause of death is poisoning due to zinc phosphide.” Investigators are yet to determine whether the deaths were the result of a suicide pact, accidental contamination or a planned murder.…