Manchester United will find themselves at the centre of a Football Association (FA) investigation after supporters went on the rampage during their side's League Cup win at Barnsley on Tuesday.
Goals from Danny Welbeck and Michael Owen guided United into the fifth round despite some spirited resistance from Mark Robins's Championship side.
But United's celebrations were tempered by the news that some of their 5,000 travelling fans trashed fast food kiosks in the North Stand of Oakwell and robbed cash from tills, forcing staff to flee in terror.
Police were called in to investigate but no arrests were made. Barnsley confirmed they had launched a full investigation into the incidents and would be submitting a report to FA officials.
The circumstances surrounding the trouble overshadowed what had been a terrific game. But United suffered more shame on the pitch as Gary Neville was sent off with a straight red card on 63 minutes for a dangerous tackle on Barnsley's Adam Hammill.
He will now face a three match ban and is set to earn a rebuke from manager Sir Alex Ferguson, who admitted the referee had got a decision right after Chris Foy dismissed the player.
Ferguson now has to decide whether or not to retain Owen in his starting line-up for the visit of Blackburn Rovers to Old Trafford on Saturday.