Other three top engineers were suspended, including Heinz-Jakob Neusser, the head of brand development. A source close to Volkswagen’s board said its executive committee would meet on Wednesday to discuss the appointment of U.S. law firm Jones Day to lead an external investigation. At the same time, the discovery of this breaking rules action at Volkswagen opens interest to further investigation to discover what carmakers were doing to mask emissions. “The Volkswagen scandal was just the tip of the iceberg,” said Greg Archer, clean vehicles manager at T&E. Volkswagen shares have plunged about 35 percent since it admitted to cheating U.S. emissions tests. The German car industry employs more than 750,000 people and is a major source of export income.