Shocking footage showed a man being sent down three rows in the stands during England's quarter-final win over Fiji on Sunday.
England won 30-24 at the Stade Velodrome in Marseille, with Steve Borthwick's side now reaching a sixth Rugby World Cup semi-final.
They will face the winner in the clash between hosts France and South Africa at the Stade de France, Paris.
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But there were some unpleasant scenes as supporters were seen fighting in a video which went viral on social media.
On X, formerly known as Twitter, account GoodBadRugby said fans in the upper tier were removed for fighting.
At the centre of the fracas were two men dressed as Lord Nelson, a Royal Navy officer in the 1700s.
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Punches were thrown and one individual launched another man two or three rows forward onto fellow spectators at a sickening impact before another grabbed him.
The match was going on as they chaotic scraps took place, with children present.
The cause of the trouble has not been disclosed, nor have any details on any potential injuries or punishment for those involved in the fighting.
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The scenes were widely condemned by fans online, with some branding it "a national embarrassment", "shameful and "disgusting".
One wrote: "Shameful. Never seen this in rugby before. How disgusting."
A second said: "We always like to show ourselves in the best light don’t we."
A third added: "Thugs not fans".
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A fourth stated: "Same old story with England fans."
Another made the point: "Didn’t think this happened at rugby? Thought they were all gentlemen? Savages. Hopefully banned for life."
A final user fumed: "Imagine coming to a sporting event as joyous as this and having a fight."
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Topics: England, Rugby, Rugby Union, Fan Reactions
Josh Lawless