Audi CEO Rupert Stadler was taken into custody by German authorities Wednesday as fallout from the Volkswagen emissions scandal continues almost three years after the fact.

According to Bloomberg, authorities were concerned that Stadler would tamper with evidence.  Prosecutors have been investigating Audi’s role in the diesel emissions scandal since 2015.  Audi is one of many well known members of the Volkswagen Group, which also includes Bently, Porsche, Lamborghini and others.

The scandal began in 2015 when the United States Environmental Protection Agency (EPA) notified the automaker it had discovered a violation of the Clean Air Act.  It was discovered the Volkswagen had programmed turbocharged direct injection diesel engines to shut off their emission controls after lab testing, leading to emissions of 40 times more nitrogen oxides while on the road.

Volkswagen is currently under investigation in 55 countries and has earmarked about 27 billion euros (about $31 Billion) in buyback, fines and other related costs.