The detectives have arrested Hefazat-e-Islam's central joint secretary general and Dhaka city president Allama Junayed Al Habib from Baridhara in the capital.
Mahbub Alam, the joint commissioner of the police's detective branch (DB), confirmed the arrest to Jago News on Saturday afternoon.
There are several cases, including one filed over the violence at Shapla Chattar in the capital's Motijheel on May 5, 2013, against Junayed Al Habib, he said.
With him, a few leaders of the organization were arrested by the law enforcers in cases filed over the 2013 incident for the last couple of days.
TT/SU