MUMBAI, May 8 -- Ten days after a couple and their two teenage daughters fell violently ill after eating watermelon at their home in Pydhonie, and died with hours of one another, Mumbai police is treating the deaths as a case of possible homicide or a suicide pact. A report by the state-run Forensic Science Laboratory (FSL) submitted on Thursday to the investigators said traces of zinc phosphide, a highly toxic rodenticide had been found in samples of the viscera taken from all four deceased members of the Dokadia family. Traces of zinc phosphide were also found in the watermelon samples taken from the Dokadias' home, a significant finding as all four family members had eaten the fruit after having dinner with their relatives. Within hours ...