The chief executive of German carmaker Audi, Rupert Stadler, has been arrested in connection with an investigation into the diesel emissions scandal, according to a spokesperson of Volkswagen ,the company which owns Audi.
He was held to avoid the risk of Stadler suppressing the evidence.
The scandal erupted three years ago, when it was found out that cars had been fitted with devices designed to cheat emissions tests.
The devices were initially found in VW’s cars, but its Audi subsidiary has also been embroiled in the scandal.
Last month, it admitted that another 60,000 A6 and A7 models with diesel engines have emission software issues.
That is on top of the 850,000 recalled last year by Audi, of which only some have been found to require modification.