The chief executive of Volkswagen, Martin Winterkorn, has resigned amid the growing emissions cheating scandal. His resignation comes as Germany’s transport minister says Volkswagen has admitted using the same fake emissions test in Europe as it used to falsify results in the United States. The Justice Department is reportedly conducting a criminal investigation into the reports Volkswagen illegally installed devices in certain diesel cars in a deliberate bid to avoid EPA emissions rules. Congress says it will also conduct hearings into the matter.