The case relates to the sensational deaths of six members of a family over a 14-year period with Jolly Joseph, who allegedly poisoned them to death, being named as the prime accused.
Kerala police Chief Loknath Behra, who reached Vatakara to assess the progress of the preliminary investigation, said six teams would conduct inquiries.
Kerala Police claim the accused killed six of her relatives using cyanide-laced food or drinks. They exhumed five bodies and conducted postmortem as part of an investigation, which was launched after a confidential complaint by one of her relatives.
A huge crowd, which had gathered in front of the court premises, booed the three accused when they were produced.
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