Rab claimed to have arrested two alleged militants in Tarabo area of Rupganj upazila in Narayanganj yesterday.
Documents relating to militancy were also seized from Mamunur Rashid alias Mamun, 34, and Ismail Hossain, 29, who belong to Sarwar-Tamim group, said Rab-11 senior assistant director Shakil Ahmed at a press briefing at its office in Adamjee area of Shiddhirganj.
A case was filed against them with Narayanganj Bandar Police Station.
Rab said Mamun studied at a madrasa in Noakhali. He engaged in militant activities by exchanging audios with a known militant in 2016, they said.
Ismail passed class VIII in 2005 from a madrasa in Dhaka's Turag area.