New Delhi: Sources from Indian Law Enforcement Authority told ReutersSeven years later, details of his involvement in one of India’s largest bank frauds were made public.

The source added that the Indian government had filed a request for Choksi’s extradition before his arrest, but he could challenge it on medical grounds.

The Punjab National Bank (PNB) is India’s second largest state-owned lender, which announced in 2018 that it had found frauds allegedly defrauded $1.8 billion in a single branch in Mumbai.

The bank has filed criminal lawsuits against multiple entities with the federal investigative agency in India, including billionaire jeweler Nirav Modi and his uncle, managing director of Gitanjali Gems, saying they had deceived PNB.

Indian federal police filed fraud charges against Choksi, Nirav Modi and others for alleged involvement in fraudulent transactions, which caused huge losses to PNB.

Two diamond tycoons denied any misconduct.

Choksi said in a 2018 letter that “investigation agencies are acting with predetermined ideas and interfering with the process of justice.”

Reuters It was not possible to contact the attorney immediately on Monday.

Nirav Modi fled India in 2018, and then details of his alleged role in the case were revealed. He was arrested in the UK in 2019 and remains in custody despite losing one extradition appeal.

Last week, a Pakistan-born Canadian businessman was accused of extraditioning him in the U.S. in terrorism case, landing in New Delhi in 2008 attacks in Mumbai after his first transfer was extradited by the U.S..