Rapid Action Battalion (Rab) arrested three criminals and recovered firearms in two separate raids in the district on Thursday night.
A Rab team raided a den of outlawed Biplobi Communist Party at Ballavpur village in Sadar upazila in the district and arrested Anwar Hossain, 45, and Selim, 36.
Two Indian made shutter guns and four bullets were recovered from their possession, Rab said.
Another Rab team raided Khasmathurapur village in Daulatpur upazila at about 11:00pm, arrested Mamun of gang group Lalchad Bahini and recovered a light gun. He is accused in several cases for murder and abduction, police said.