Citing “a source familiar with the probe,” Reuters said on Thursday that the subpoenas from Manhattan U.S. Attorney Preet Bharara were sent to Mt. Gox, other Bitcoin exchanges, and businesses that deal in the virtual currency.
The investigation is focused on the recent distributed denial of service attacks that forced Mt. Gox and other exchanges to suspend withdrawals.
A spokesman for Bharara declined to comment to Reuters. A spokeswoman for the attorney’s office told CNET that it’s common practice to neither confirm nor deny investigations.
On February 11, the Bitcoin Foundation revealed that some exchanges had halted withdrawals after being hit by DDoS attacks. More