State run lender Punjab National Bank informed the exchanges late last night that the quantum of fraud in the Nirav Modi case could be more by Rs 1,300 crore than the current amount of Rs 11,400 crore which it disclosed on February 14. This new revelation takes the fraud amount to over Rs 12,700 crore.In a filing to the BSE late on Monday night, the bank said the amount of unauthorised transactions could go up by more than Rs1,300 crore. “...We have to inform that quantum of reported unauthorised transactions can increase by $204.25 million (approximately),” the filing said.Earlier this month PNB unearthed a Rs 11,400-crore alleged fraud that has been going on since 2010 at the Brady House branch of the bank in Mumbai. It came to light after an employee who was rolling over the letter of undertakings retired.PNB has blamed other banks for negligence, stating that there was connivance between group companies of Modi and Gitanjali with executives at its branch and those of overseas branches of those other Indian banks. As many as 30 banks discounted the bills based on PNB’s LoUs.The bank had recently clarified that 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 had said. This new revelation had then taken the fraud amount to Rs 11,400 crore.PNB also clarified that it has not received any communication from government in respect of payment of fraud liabilities.