Those arrested were identified as Rabbi Islam alias Ghulam Rabbi, 24, of Pirojpur district; Abdul Karim, 27, Kartik Sheel, 25, and Badshah Shaikh, 23, of Rampal Upazila.
On January 14, the ‘bomb calorimeter’ machine was stolen from Rampal Power Plant. A case was registered in this regard on January 16 at Rampal police station.