Volkswagen AG's Porsche brand faces a formal probe by German prosecutors as the diesel-emissions scandal spreads to VW's iconic sports-car maker. Prosecutors in Stuttgart said they were escalating an informal investigation started last year into allegations the Porsche brand may have defrauded consumers by selling autos with software that manipulated emissions. While no individual suspects were named, investigators are looking into the role of employees at the Porsche brand in Germany and the U.S., Jan Holzner, spokesman for Stuttgart prosecutors, said in an emailed statement July 10.
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