The Department of State Services (DSS) says it has arrested some members of organised syndicates involved in the sale of the new redesigned naira notes.
The DSS, in a statement on Monday by its spokesman, Peter Afunanya, accused some commercial bank officials of aiding the crime.
The DSS also urged appropriate regulatory authorities to step up monitoring and supervisory activities to expeditiously address the emerging trends.
Dr Afunanya noted that the Service has ordered its Commands and Formations to further ensure that all persons and groups engaged in the illegal sale of the notes are identified.
The Service through its spokesman urged anyone with useful information relating to the illegal sale of the new naira notes, to pass the details to the relevant authorities.