The elite force recovered books and leaflets on extremism from their possession
They were detained from Nikunja area under Khilket unit of the capital around 9:30pm on Saturday.
Mizanur Rahman Bhuiyan, senior assistant director of RAB's Legal and Media wing, told Dhaka Tribune that RAB conducted a drive at the Nikunja area and detained the four suspects from there.
The detainees are Masum Miah, 30, of Comilla, Abu Bakar Siddique alias Imran, 19, of Gazipur, Rakibul Hasan Siam, 18, of Munshiganj, and Abdullah Al Roman alias Monirul Islam alias Faruk Ahmed, 22, of Jhenaidah.
The elite force recovered books and leaflets on extremism, and mobile phones from their possession.