Mumbai: The fraud-hit Punjab National Bank (PNB) has reported an additional Rs 1,300 crore unauthorised transactions, taking the estimated quantum to Rs 12,600 crore in the scam related to diamond trader Nirav Modi and owner of Gitanjali Gems, Mehul Choksi.

In a 11.22 p.m., late night filing with the stock exchanges on Monday, the bank said: "In continuation to our filing with stock exchanges on February 14, 2018, we have to inform that quantum of reported unauthorised transactions can increase by $204.25 million."

The Central Bureau of Investigation on Monday said it questioned PNB Executive Director K.V. Brahmaji Rao, two General Managers and a retired official in connection with its probe into the multi-crore fraud.

The Income Tax Department also said it had attached 66 more bank accounts related to accused Choksi.