"We will continue to move forward with this investigation, wherever it leads, and we will bring to justice those who defrauded the American public and members of our community out of their hard-earned money," said IRS special agent in charge Daniel W. Auer.
A group of three-dozen Rothstein investors alleges that TD Bank helped Rothstein run his scheme, and seeks more than $100 million in damages from the Canadian firm.
"The Ponzi scheme would never have worked without the bank's cooperation and blind eye of the senior management at TD Bank to what was going on there given the tremendous amount of my clients' money that was flowing through trust accounts in that bank," William R. Scherer, an attorney representing the investors, told ABC News.
Read the civil suit, in its entirety, by clicking here.
In a statement, TD Bank denied any wrongdoing.
"It is best not to jump to conclusions on our involvement or speculating on the total dollar loss, if any, or any amounts held in our bank," said Rebecca S. Acevedo, public relations manager at TD Bank. "The claims are solely allegations and not evidence of any wrongdoing on the part of TD Bank."
Last week, Scherer amended his complaint to add new defendants: Banyan Income Fund and its executive George G. Levin; Onyx Options Consultants Corporation and its owner Michael Szafranski; Irene Stay, CFO of Rothstein's law firm; and Berenfeld Spritzer Shechter Sheer, LLP, which audited Banyan and the law firm. Attempts to reach George Levin were unsuccessful.
"We believe that George Levin and Banyan was involved to conspire against us," said Scherer. "Banyan was the big fund that had the exclusive for doing these deals with Rothstein."
By administrative order, the civil case has been assigned to Judge Jeffrey Streitfeld in Florida State court. The first conference on the matter is scheduled for mid-January.