The Rapid Action Battalion (RAB) has detained two alleged criminals from Office Para in the district's Maheshkhali upazila.
The detainees have been identified as Khairul Alam, 25, son of Omar Ali, and Saiadul Karim, 33, son of Nuru Mia of the upazila.
Acting on a tip-off, a Rab-15 team conducted a drive in the area and detained the duo around 4.30am on Wednesday, said senior assistant director of the unit.
Four guns and four bullets were seized from their possession, the officer said, adding that three of their accomplices managed to escape
The detainees were involved in many criminal activities, said the elite force.