Stade Francais' win over Toulon in France's Top 14 on Sunday was marred by a fracas which saw a brother of one of the players run on to the pitch to get involved.
Home side Stade, who won the match 37-10, are facing a big fine and a possible stadium ban for failing to control the crowd.
Stade flanker Sekou Malacou clashed with All Black World Cup-winning wing Julian Savea, sparking a brawl involving virtually every player on the pitch.
Both players were eventually yellow carded but not before the France international's brother got involved.
He ran on to the pitch holding a flag in the pink colours of Stade. With his brother in the middle of the huge brawl he was not able to get at Savea - though he may have thought twice seeing the size of some of the players close up.
After being ushered off the pitch he then flared up in rage again, holding off a steward before angrily pointing a flag in the direction of Savea.
The incident had echoes of when former France No 8 Imanol Harinordoquy's dad ran on to the pitch to defend his son in a fight during a Biarritz v Bayonne clash in 2011.
The win leaves Stade second in the French top flight and Toulon down in 12th, though they face the prospect of being forced to play behind closed doors for the next home game, the Paris derby against Racing 92.