The fan was caught in the act

A German football fan has been arrested after he was allegedly caught 'masturbating in the stands' while watching a Bundesliga clash.

The unknown Hertha Berlin supporter was snapped on video midway through the lewd act - and it was quickly uploaded to social media for all to see.

The images of the man sprawled across the terraces with his jeans around his ankles unsurprisingly went viral, with many struggling to understand why someone would choose a football stadium to partake in such an act.

He was seen being accosted by Schalke stewards before being ejected from the arena during their 1-0 victory over Hertha.

Originally posted by Twitter user @dueSe04, the Schalke fan wrote: "This really happened in the Arena yesterday. Unbelievable," before the video and pictures were later deleted.

The pictures have been circulated among several German newspapers with the publications reporting the man had been arrested after a scuffle with police.

He now faces indecency and assault charges.

A first-half strike from Marko Pjaca was enough for Schalke to overcome the visitors and help them move up to second, whilst the capital city club slumped to 12th in the Bundesliga.