BERLIN, February 12 - RAPSI. The Stuttgart prosecutor's office is investigating charges of a Volkswagen refinancing fraud against members of the Porsche supervisory board, the newspaper Sueddeutsche Zeitung writes, citing an unnamed source at the company.

Former Porsche CEO Wendelin Wiedeking is thought to be involved in the case. The names of the other suspects on the company's supervisory board have not been disclosed.

The Porsche supervisory board includes Uwe Huck, the Chairman of the Groups Works Council of the Dr. Ing. h.c. F. Porsche AG, and Bernd Osterloh, the Chairman of the General Works Council of Volkswagen AG.; Ferdinand Piech, the Chairman of the VW supervisory board; and Wolfgang Porsche, a member of the Porsche and Audi supervisory boards.

The indictment against former Porsche CEO Wendelin Wiedeking and former CFO Holger Haerter regarding the Volkswagen refinancing fraud was sent to the court in December 2012. The Stuttgart court has not yet adopted a decision regarding a trial.

Wiedeking and Haerter have been charged with providing false information about VW shares during loan refinancing talks in 2009. Porsche owned a stake in VW, and these named in the case were authorized to deal with the company's financial issues.

The Stuttgart prosecutor's office previously said that the charges are based on Porsche's failed attempt to buy a larger stake in VW in 2008. Wiedeking and Haerter planned to buy Volkswagen, but Porsche ultimately became part of VW. Now investors are accusing the former Porsche executives of deceiving them while trying to take control of VW.

Porsche and VW agreed to combine in August 2009 and planned a full merger, after Porsche failed with its hostile bid for VW. The Stuttgart probe and investor lawsuits prompted VW to consider alternatives to the 2009 agreement, under which the merger was to be completed by the end of 2011.