Other PSU banks were under pressure too and fell by up to 8 per cent after the Reserve Bank of India (RBI) came out with new norms for recognising stressed assets.
The stock of PNB settled at Rs 145.20 on the NSE, a slump of 10.29 per cent from its previous close. During intra-day trade, the scrip had touched a low of Rs 145.15.
Similar movement was witnessed on the BSE, as the scrip closed 9.81 per cent lower at Rs 145.80. It had opened at Rs 160 and soon touched an intra-day low of Rs 144.70.
In a regulatory filing to stock exchanges today, PNB said it has detected some fraudulent transactions with financial implication of USD 1.77 billion (about Rs 11,335 crore), and the matter has been referred to law enforcement agencies for recovery.
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The bank has detected some fraudulent and unauthorised transactions (messages) in one of its branches in Mumbai for the benefit of a few select account holders with their apparent connivance, PNB said.
Based on these transactions, other banks appear to have advanced money to these customers abroad, it said.
Bank of India lost 7.87 per cent, followed by Allahabad Bank (7.79 per cent), Oriental Bank of Commerce (7.43 per cent), Canara Bank (5.82 per cent), Syndicate Bank (4.49 per cent), IDBI Bank (4.22 per cent) and Bank of Baroda (1.75 per cent).
"The PSU banking space was the party spoiler today as we saw massive cut in individual names within this basket. Going ahead, one needs to keep a close eye on this basket as follow-through selling may result in further dampness in the market," said Sameet Chavan, chief analyst-technical and derivatives at Angel Broking.