The detectives also recovered Tk 60 lakh of the stolen money and also seized two foreign pistols from their possessions.
The arrestees are identified as –ring leader Hannan alias Briefcase Hannan alias Robin alias Rafiqul Islam and his three associates-- Md Mostafa, Md Babul Mia and Parvin.
Based on secret information, a special DB team conducted simultaneous drives at various places in the capital and arrested the four suspects on Monday night, said Joint Commissioner (DB) Md Mahbub Alam.
Briefing reporters at the DB headquarters at Minto Road on Tuesday, the Joint Commissioner (DB) said a bag, containing approximately Tk 80 lakh in cash collected from various branches at Old Dhaka of the National Bank, allegedly went missing from a vehicle of the Bank on May 10.
The National Bank authorities filed a case with the Kotwali police station over the incident, he said adding that the DB has started shadow investigation into the case alongside local thana police soon after the incident.
The detectives arrested the four people scrutinizing various information and evidence, which were found at one stage of the investigation, Mahbub Alam said.
When asked about the remaining lost money, Mahbub Alam said they (arrested people) apparently spent Tk 20 lakh in different ways. There are several cases against the arrested people in different police stations.
Arrested Hannan alone is accused in more than thirty cases, he said, and adding that the case is under investigation.