At the same time, AFP News reports that U.S. prosecutors are believed to have served a subpoena on the company.
Both actions follow the website for Mt. Gox going dark, the latest issue for the embattled company.
The Japanese investigation follows claims of a multi-million dollar theft from the exchange’s digital vaults.
Meanwhile, the Wall Street Journal reports that U.S. Federal prosecutors in New York have served Mt. Gox with a subpoena demanding certain, unspecified documents.