“ Santanu Bhowmik was murdered in front of a large number of police in a mysterious circumstance. Before and after the killing of the jourlist, there has been negligence on the part of Tripura Police. If the CBI probes the killing, the truth would come out,” Dey said while addressing the demonstration. DGP A K Sukla said that police have so far arrested three persons, including the main accused Sachin Debbarma, who was arrested for the killing of the 28-year-old jourlist.