The Anti-Terrorism Unit (ATU) of police on Friday arrested two members of banned militant outfit Ansarullah Bangla Team (ABT) from Muktagachha upazila in Mymensingh.
The arrestees were identified as Md Kawsar Ahmed alias Milon, 30, of Muktagachha, and Zahid Mostafa, 20, of Chandimondo village.
Two mobile phones, four SIM cards and seven books of extremist ideology were seized from their possession, the ATU said in a release.
It said screenshots of 34-page Facebook and Messenger chats about their organisation's extremist activities were found stored in their mobile phone sets.
The duo was selling books on extremism to ABT members across the country, using multiple fake Facebook profiles.
A case was filed with Muktagachha Police Station, said the release.