The investigation into Volkswagen’s diesel emissions cheating scandal rages on with the arrest of Audi’s current chief executive officer Rupert Stadler, according to Munich prosecutors. This news comes from Automotive News Europe, which reported that the executive is being held in custody because investigators feared he might be seeking to suppress evidence in relation to the probe.

“The suspect has been seen by a judge, who has ordered him to be remanded in custody,” read a statement from the prosecutor’s office, which widened its investigation against Audi last week. It named Stadler among the suspects accused of fraud and false advertising.

Stadler’s arrest was confirmed by a spokesperson of the greater Volkswagen Group, adding that the presumption of innocence applied to his case. Audi had no immediate comment regarding the arrest, and Stadler himself as well as Munich prosecutors were not immediately available for comment.

The public prosecutor’s office said that it was investigating 20 suspects, and that it had raided apartments of Stadler and another board member last Monday. That other member is said to be Audi’s head of purchasing Bernd Martens, according to a person familiar to the investigation, who declined to be named because prosecutors had yet to disclose the name, Reuters reported.

Martens led a diesel task force at Audi, set up to coordinate the handling of the so-called Dieselgate scandal with its parent company.