In the MHA office, it was declared that the Bengal government and the Railways have been asked to help the CBI, and hence it will be a joint probe.
However, a senior CBI official said, We are yet to receive the order. So the technicalities of how the investigation will be conducted are not clear to us. We are not even aware whether the director of CBI will hand over the responsibility of the investigation to the Kolkata zonal office or a team from Delhi will be sent to the state for the investigation. It was even said to the press that there will be a joint probe. But how can there be a joint probe as the chargesheet has to be submitted by one investigating officer And if it is a CBI probe then the chargesheet would be prepared by the CBI alone, he said.
The issue is not even clear to the Bengal police and the CID, who have reportedly made considerable progress in the case; the agency has claimed to have collected several evidences in the case.
Since we have not received any order in black and white as of now, it will not be right to comment on the issue. But it can be said that if it is a CBI probe, the chargesheet will be submitted by the CBI. No agency can conduct a parallel probe when the case has been taken over by the CBI. But the CBI sleuths have to rely on the reports of Bengal police.