Audi chief exec arrested over dieselgate .

The chief executive of Audi has been detained by German authorities investigating the 'dieselgate' scandal at parent firm Volkswagen.

Prosecutors in Munich said Rupert Stadler - the most senior group official to be held since the saga began - was arrested at his home in the early hours of Monday due to fears he might obstruct their continuing investigation.

He was later remanded in custody by a judge, they added.

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