Police arrested three activists of Islami Chhatra Shibir from a house in Syaderbali area of Madaripur Sadar upazila early yesterday.
They also recovered five petrol bombs, three machetes, books on jihad and four laptops from their possession, said police.
The arrestees are Zakir Hossain, 25, president of Madaripur district unit of Shibir, its secretary Mazbauddin Sarder, 24, and activist Arman Khalashi, 22. They are the students of Government Nazimuddin College.
On secret information, a police team raided the house and arrested the Shibir men with the bombs, books and laptops when they were holding a clandestine meeting there to commit crime.