A court in West Bengal's Barasat area placed Nur Hossain, the prime suspect in the Narayanganj District murder case, and his two associates, on an eight-day police remand.
A Second Judicial District Court judge in Barasat of West Bengal passed the order after police filed a case against them with Baguiati Police Station on charge of infiltration, gambling and possessing firearms.
Hossain and his two aides were arrested by the anti-terrorism squad of the Kolkata Police on Saturday night. The two aides have been identified as Zahidul Zaman and Selim Bidhan. They were picked up from the Indraprastha apartment complex in Koikhali area.
Law enforcers also recovered a firearm, several mobile SIM cards, and a laptop during the raid.
Hossain allegedly fled Bangladesh two days after abducting and killing seven people including Narayanganj panel mayor Nazrul Islam and senior lawyer Chandan Sarkar, on April 27.
Three days later, six bodies were found floating in the River Shitalakkhya.
The other body was recovered from the river the following day.