Bankers said the Gitanjali group had a standard account with IDBI Bank and Dena Bank
The trading patterns of the companies as well as their senior officials who have come under the lens would also be looked by Sebi
'There is a clear criminal connivance of group companies of Nirav Modi and Gitanjali Gems,' said PNB
Data released by the RBI last March revealed that during the first nine-months of 2016-17, 455 cases of fraudulent transactions of Rs 100,000 and above were detected at ICICI Bank
Modi has been relentless in building his brand regardless of banks having a problem of fraudulent and unauthorised transactions with his companies
Some banks have direct exposure to Nirav Modi's companies
Confirming the development, an ED official said that search operation is underway and would continue for two days
PNB cautioned other banks about modus operandi of fraud in a letter that Business Standard has reviewed
CEO said that the scam was detected by bank officials for the first time on January 25
'If PNB does not pay up, it will lead to double provisioning-- both PNB and 30 other banks will have to provide for the huge loss'
On Jan 23, Modi, who is believed to be in Switzerland, was also present in a group photo of Indian CEOs with Prime Minister Narendra Modi
PNB, India's second-largest state-owned lender after State Bank of India (SBI), is now valued at just Rs 311 billion
The bank has claimed in three complaints to the CBI that so far it has detected 150 LoUs which were fraudulently issued by its officials in connivance with Nirav Modi
While PNB did not name the other lenders, Union Bank of India, Allahabad Bank and Axis Bank are said to have offered credit based on letters of undertaking (LOUs) issued by PNB
PNB Chairman and Managing Director Sunil Mehta said it has the capability to recover the dues from Modi and promised to take action against all wrongdoers
The finance ministry has issued an advisory to all banks to review their large customer exposures, according to media reports
The committee is headed by senior Congress leader Veerappa Moily, and former prime minister Manmohan Singh is also a member
The search operation came after the agency filed a Rs 2.8-billion money laundering case against Modi; his wife, Ami; brother Nishal; and Choksi on Wednesday, following a complaint by PNB
The PNB chief also said Modi had come out with 'vague offers' to repay the amounts due and had not submitted a concrete plan
Financial Services Secretary Rajiv Kumar told media persons PNB had 'sufficient funds' to provision for the losses arising out of the fraud