"It's a matter of investigation and it is some unscrupulous people who have managed to beat the system," Jaitley said when asked if he expects involvement of more banks in this issue.
"Now you have CBI investigating, you have ED investigating, you have SFIO investigating, you have tax people looking into it. So, once these investigative agencies form a prima facie opinion, its only then the magnitude, the nature and the kind of people involved in it will become clear," he told CNBC TV18.
It is also alleged that the amount was deposited in 59 accounts of the bank's Ashok Vihar branch (New Delhi) in cash as advance for import and the money was sent to some select companies in Hong Kong.
The branch opened 59 current accounts from May 2014 to June 2015 through which large foreign exchange remittances were made, the bank said in a regulatory filing.