Police on Saturday night recovered six crude bombs during a block raid at the central office of Islami Chhatra Shibir in Chawkbazar area of the port city.
Chattogram Metropolitan Police (CMP) Deputy commissioner Mehedi Hasansaid police cordoned off the office of the student wing of Jamaat-e-Islami after hearing several blasts inside it around 7:30pm.
Later, the law enforcers in association with the members of the bomb disposal unit entered the office and started searching rooms there, he said.
At one stage they found six crude bombs in a room, said the assistant commissioner.
Police, however, could not arrest anyone from the spot as the Shibir men managed to flee the scene immediately after the blast, said the official, according to UNB.