They have come to Bandaragama in a luxury car, reports add.
Police have also seized 2 pistols and 29 live ammunition in their possession. According to the numbers on the firearms, it is suspected that the firearms belonged to the LTTE.
The arrested STF Inspector - T.M.U.B. Tennakoon is said to be a nephew of a former secretary to the ministry of Law and Order.
The suspects are to be produced before the Horana Magistrate today.