CBI sources said they are going to complete their preliminary enquiry which focusses on licensing procedure and violations by the exchange and if any evidence is detected, they might file an FIR in the case.
The sources said the agency was contemplating to close the enquiry because of an ongoing probe by the Economic Offences Wing of the Mumbai Police but during the course of its enquiry it found some leads which prompted it to dig deeper into the issue.
The sources said the inquiry is still at a preliminary stage and CBI is trying to unravel all the angles of a potential conspiracy.
The sources said some of the contracts given by the exchange were allegedly violation of conditions given under FCRA Act.
The exchange has been facing problems in settling Rs 5,600 crore dues of 148 members and brokers, representing 13,000 investor-clients, after it suspended trade on July 31 last year on the government's direction.