A team of Rapid Action Battalion (Rab) detained three active members of the banned militant group 'Ansar al-Islam' from Belpukur area in Rajshahi early Monday.
The detainees are Md Raju Ahmed, 24, son of Md Abu Bakar Siddiq, Md Farhad Hossain, 30, son of Md Aktar Ali and Md Jahangir Alam, 36, son of Akkas Ali, residents of Jamira village under Belpukur Thana.
The elite force claimed to have seized jihadi books and leaflets from their possession.
Lt Col Mahbub Alam, commander of Rab-5, confirmed the news today to the journalists.
"They are being interrogated. Details about them will be disclosed later", he added.