(Harrisburg) -- Major players in Harrisburg's pricey incinerator retrofit could soon find themselves in the middle of a federal investigation. City Councilman Brad Koplinski is calling for such a probe into the financing behind the project that's plunged the capital city into more than $300 million in debt. The announcement comes on the heels of a forensic audit of the troubled city's finances released by The Harrisburg Authority. But Koplinski says the audit didn't go far enough in questioning the bond insurers, law firms, and governmental organizations involved. "The problem with the audit was that it did not have subpoena powers, so you had individuals, entities, and law firms not give documents or refuse to be interviewed for the audit," he says. "So, really, what needs to be done is that a federal investigation should be started." Koplinski says a federal investigation, which could involve the Department of Justice, Securities and Exchange Commission, and Internal Revenue Service, would come at no expense to city taxpayers. He adds he'll ask fellow council members for their support at next week's city council meeting.