The held persons have been identified as Kalia Singhari and his son Dolabgobinda Singhari, Kalu Panigrahi, Baba Mohapatra, Muna Patra and Sandeep Jena.
Sharing the details of investigation process and the identities of the held persons Puri SP Kanwar Vishal Singh informed that the conspirator father-son duo had planned the killing to avenge the murder of former BJD councillor and servitor Taluchha Bhagaban Mohapatra alias Guna Singhari.
Guna Singhari had been murdered in August 2012 in Puri town.
Krushna Chandra Pratihari was among six others who had been arrested in Guna Singhari murder case had been acquitted on January 20.
Pratihari was shot dead near Barabati area in Puri on March 16. Kalia and Dolagobinda had paid Rs 2 lakh to Kalu to gather manpower for the murder while Muna had supplied the pistol and Sandeep was in charge of arranging a hideout for the assailants. Baba was present at the crime spot, added police.
Police have recovered Rs 1.5 lakh from Kalu and raids are underway to nab a few more persons who are involved in the killing.