Investigators looking into Volkswagen Group's diesel-emissions scandal have found no suspicious facts against the head of Audi, three people familiar with the matter said.Volkswagen CEO Matthias Mueller said on Tuesday that Audi CEO Rupert Stadler had been questioned by U.S. law firm Jones Day but gave no details about the inquiry.
A report by the German Der Spiegel magazine said witnesses inside the company alleged the executive had known about the engine manipulation since 2010.
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