The National Tax Service (NTS) of Korea opened a “special tax investigation” into the affairs of Bithumb Holdings and its subsidiary companies, according to Korean news outlet Yonhap News.

Tax authorities are scrutinizing all group company’s domestic and international transactions to uncover possible tax evasion and money laundering.

Former Bithumb Holdings Chair Lee Jung-Hoon was recently cleared of fraud charges over a lack of evidence. The incident stemmed from the alleged theft of $100 million from the Chair of the BK Medical Group, Kim Byung-Gun, who was negotiating an acquisition deal.