Police have arrested Sujon Sikder, joint convener of the Gopalganj district unit of Swechchhasebak Dal, in connection with clashes during an NCP march. Authorities confirmed that he was shown arrested on Wednesday under the Anti-Terrorism Act. The violent incidents took place on July 16, when an NCP rally in Gopalganj erupted into widespread clashes. So far, police have filed 15 cases, including five for murder.