Companies belonging to Modi and his uncle Mehul Choksi, who heads the Gitanjali group, have been accused by Punjab National Bank of defrauding the bank of over $2 billion. The bank alleges firms controlled by the duo colluded with rogue PNB staff to secure fraudulent guarantees that were used to raise credit from overseas branches of Indian banks.
Both Modi and Choksi have denied wrongdoing, and so have two key accused PNB employees in the case, which has so far led to 19 people being arrested.
The latest Union Bank figures are separate from the $300 million exposure it had previously reported on account of the fraudulent PNB guarantees, said Rajkiran Rai, Chief Executive of state-run Union Bank.
Lenders including Union Bank have recalled loans to Modi's and Choksi's firms after the news of the fraud, according to the authorities.
(This story has not been edited by NDTV staff and is auto-generated from a syndicated feed.)