PANews reported on December 28 that according to Bloomberg, the U.S. Department of Justice (DOJ) has launched a criminal investigation into the FTX hacking incident. It is reported that the investigation is separate from the fraud case of former FTX CEO SBF, and the authorities have frozen some of the stolen funds. Blockchain experts believe that multiple clues indicate that this is an internal crime, including hackers simultaneously invading the FTX and FTX US websites, accessing multiple cold wallets, and using personal Kraken accounts to withdraw gas fees for at least one transaction. According to previous news, on the night that FTX filed for bankruptcy, the exchange was hacked and hackers stole more than $450 million in assets from FTX hot wallets.