A member of Volkswagen's supervisory board says he expects further resignations at the automaker after a global scandal over rigged U.S. emissions tests.
Olaf Lies, economy and transport minister of VW's home state Lower Saxony, which holds a 20 percent stake in the company, said the investigation into the scandal was only just starting.
"There must be people responsible for allowing the manipulation of emission levels to happen," he said.
Lies spoke following the resignation of Volkswagen CEO Martin Winterkorn.
Winterkorn said Wednesday he took responsibility for the "irregularities" found by U.S. inspectors in VW's diesel engines, but insisted he had personally done nothing wrong.
VW is filing a criminal complaint with German prosecutors, seeking to identify those responsible for any illegal actions in connection with the scandal.