SALT LAKE CITY (AP) — Two top executives of a Salt Lake City-based biodiesel company have pleaded not guilty to fraud and other federal charges accusing them of filing false claims that resulted in the company being issued $511 million of renewable fuel tax credits.

Court records indicate Washakie Renewable Energy CEO Jacob Kingston and CFO Isaiah Kingston entered their not-guilty pleas Friday in federal court in Salt Lake City.

An indictment unsealed Friday said the two men each hold a 50 percent ownership interest in WRE and that the company's website described it as Utah's largest producer of clean burning and sustainable biodiesel.

The U.S. Attorney's Office for Utah said the indictment stemmed from an investigation by several federal agencies, including the Environmental Protection Agency, the IRS and the Defense Criminal Investigative Service.