Police in a drive arrested 11 Shibir activists including its district unit president from Bethuli village in Kaliganj upazila on Friday evening.
Tipped off, police conducted a drive in the area and arrested them while they were holding a clandestine meeting for carrying out sabotage, said Mahfuzur Rahman, officer-in-charge of Kaliganj Police Station.
Police also recovered two cocktails, four iron rods, two knives and some leaflets from the spot.
A case was filed with the police station in this connection at night, the OC added.