Volkswagen’s German headquarters have been raided by German authorities in an ongoing fraud investigation over the diesel emissions scandal. Audi’s HQ was also searched.

VW’s executives have had a …ahemhazy memory when it comes to details on when they first learned about the “defeat device” installed in their diesel cars. U.S. prosecutors think they knew about the emissions scheme for nearly a decade, and the raid was in search of evidence to prove it.

One executive has already been arrested, and five others indicted.

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