New Delhi, Oct. 20 -- The CBI has booked retired deputy manager Gokulnath Shetty, the main accused in the Rs 13,000-crore Punjab National Bank fraud allegedly perpetrated by Mehul Choksi and Nirav Modi, in a fresh case of receiving a bribe of Rs 1.08 crore from Rishika Financials that arranged bank guarantees for Gitanjali Gems, officials said.

It is alleged that the owner of Rishika Financials, Debajyoti Dutta, was in the business of arranging quotes of Letters of Undertaking (LoUs) from foreign funding banks, they said on Monday.

The officials said that after getting confirmation from Dutta, Shetty used to issue LoUs using the international banking messaging service, SWIFT.

Dutta used to work for Gitanjali Gems, promoted by Choksi, and...