With the arrest of Santosh Panigrahi alias Ijili and Santosh Mishra yesterday, the total arrested persons involved in the incident increased to 12, said sub-divisional police officer (SDPO), Berhampur Thakura Prasad Patra.
At least four more persons allegedly involved in the murder are still at large, he said.
Two rifles, two live ammunition, six mobile phones and 14 SIM cards were seized from Panigrahi, while three mobiles and two SIMs seized from Mishra.
Both were also wanted by the police in some other cases including attempt to murder and bombing incidents.
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About a dozen persons coming in six motorcycles had killed 31-year old Shanti Mishra, also a criminal by triggering blasts. His body was recovered from a nearby pond.
Mishra was involved in at least 22 cases, in about a incidents directly, while in othes hatched conspiracy to finish him, police said.
The conspiracy to finish Mishra was mooted in circle jail, Berhampur. The main conspirator identified as Ami Padhi was inside the jail while other two Mrutunjay Sabat, a rice businessmen and Ranjit Panigrahi alias Babu, a cloth merchant, in the town were already arrested.