The country's second largest public sector lender also reaffirmed that it has enough assets to meet any liability.
"We have followed lawful avenues available to us as per law of the land to recover our dues," the bank said in a regulatory filing.
Stock exchanges had sought clarification on Modi's comment that ''PNB has closed all options to recover dues by going public".
The bank had disclosed about the scam on February 14 through a regulatory filing.
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The bank said on basis of preliminary investigation report, it had simultaneously informed its Board and BSE, NSE of initial fraud case of Rs 280.7 crore.
"Upon receiving further investigation report enhancing the fraud amount to Rs 11,394 crore, FMR (Fraud Monitoring Return) with RBI, FIR with CBI were filed in the evening of February 13, 2018, and BSE and NSE were informed on February 14 around 9 am," the bank said.
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