Kerala police Chief Loknath Behra on Saturday expressed satisfaction over the ongoing probe into the case relating to the mysterious deaths of six members of a family near here.
Behra, who reached Vatakara to assess the progress of the preliminary investigation, said six teams would conduct inquiries.
"There are six murders and six cases. The first death happened in 2002. We will have to collect evidence. Will have six probe teams and the SP will head the supervisory team.
We will discuss the matter with legal experts," Behra told reporters.
He further said the investigation was all about collecting evidence of the crime which had happened over the years.
Noting that it was a "challenging case", the DGP said, "... We will be discussing with the forensic team. They might suggest conducting various tests."