Barnsley are back in the Championship after beating Millwall in the Play-Off Final, but the game was marred by unsavoury scenes shortly before the final whistle.
A small number of Lions fans appeared to chase their Yorkshire counterparts, with some alleging that they broke through a police barrier separating supporters of the two clubs.
Barnsley were 3-1 up in the closing stages when the barrier was reportedly broken, forcing Tykes fans to make a swift exit.
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Those Barnsley fans who left were deprived of the opportunity to celebrate their team's victory.
Manchester United loanee Ashley Fletcher
put them ahead inside two minutes, with Adam Hammill's solo stunner doubling their lead.
Mark Beevers pulled a goal back before half-time, but a second-half header from Welsh international Lloyd Isgrove wrapped up victory for the Yorkshire side.
Millwall, who finished seven points above their opponents in the regular season, were denied an instant return to the second tier after being relegated in 2015.
While those at Wembley for the match reacted with a mix of fear and anger, those away from the ground turned to humour.
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