1. Since it was based on the opinion and recommendation of a panel advocate, an inquiry may be first initiated against the panel lawyer of the bank along with the currently available staff who were involved in this subject that day for their reply since you are no more employed by the organisation.
2. You should make sure to not to accept the liability at any time nor admit your fault. The local are anyone may be involved in the scandal, but you pretend as if you are not in the knowledge of any such misappropriations or fraud.
Since this is an inquiry related to your previous employment for which you dont have any information as on the date of your leaving the organisation, as a matter of fact you are not in the knowledge of them even now, you may just wait and watch the developments silently and prepare to face the inquiry with the support of documentary evidences in your favor. The inquiry if is within the organisation then there is not problem for your present employment.