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The Hammers crashed out the Europa League before it even started on Thursday night after losing 1-0 at home to Romanian minnows Astra Giurgiu.

Harrowing videos of the violence have emerged on social media.

In one clip, a supporter was aggressively confronted by another while he was speaking to a steward.

(Image: TWITTER)

(Image: TWITTER)

The violent yob punches the other man, before unleashing a flurry of right handers.

Eventually, a steward manages to separate the rowing pair.

Dramatic footage from another ugly clash shows a thug repeatedly thump a supporter in the top tier of the arena.

Horrified fans — including kids — watch on in fear as the scuffle escalates before a steward calms things down.

Although the fights happened in the stands designated for West Ham supporters, some fans on Facebook suggested a rogue Astra supporter sneaked into a home end.

While most online condemned the violence in the second clip as "pathetic" and "sad", others said the Astra fan caused the carnage.

Chris Holman posted: "It was an Astra fan."

James Rowland added: "Get your facts right, bloke in green getting hit was cheering for Astra and shutting abuse at West Ham fans and players."

West Ham had dreamed to host European football regularly at their new home in Stratford, east London, which was the showpiece venue of the 2012 London Olympics.

But the shock defeat means Slaven Bilíc's side now won't play in Europe until at least next season.

(Image: TWITTER)

A spokesperson for West Ham said: "West Ham United condemn unreservedly the behaviour of individuals involved in incidents captured on video during the fixture against Astra Giurgiu.

"This behaviour has no place in football and we will work with the police and other stakeholders to identify the individuals involved. Once identified, they will be banned from attending any West Ham United fixture for life and we will request the courts serve a banning order to prevent these individuals attending any football.

"More than 200,000 supporters have already attended our opening at the London Stadium and the West Ham United fans have been magnificent during the first four games.

"With more than 10,000 Under-16 Season Ticket Holders, we are a family-friendly Club and our priority is maintaining an inclusive environment for all home and away supporters. We will not allow one isolated incident to damage our supporters’ and the Club's reputation, hence our zero tolerance approach to this matter."