The head of Volkswagen said the company is determined to identify people responsible for an emissions cheating scam shaking the foundations of the European car maker.
The company's chairman indicated the investigation will not spare top managers.
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"We are relentlessly searching for those responsible for what happened and you may rest assured we will bring these persons to account," said Chairman Hans Dieter Poetsch at a news conference in Germany.
It was revealed in September Volkswagen had installed a device to circumvent emissions on about 500,000 diesel-powered cars in the U.S.