The U.S. Department of Justice is reportedly investigating the theft of nearly $400 million from FTX. The crypto exchange disclosed in November the day after it filed for bankruptcy that “unauthorized access” had led to the theft.

The criminal investigation is separate from the fraud case Justice is pursuing against company co-founder Sam Bankman-Fried, Bloomberg reported.

Attackers stole at least $372 million from the company, after which the firm’s executives moved the remaining funds under their control to cold storage wallets “to mitigate further risk,” its filing for bankruptcy states.