On Thursday, it was reported that the Delaware-based cryptocurrency exchange, Poloniex, has been placed under investigation by the US Department of Justice (DoJ). The move follows a number of complaints from users who had been denied access to their account profiles. The Chief Special Investigator of the Investors Protection Unit (IPU) at the DoJ has reportedly sent out an email to a number of selected active Poloniex users on July 25, asking them to revert back if they had encountered any difficulties when using their Poloniex accounts.