Sheffield United warned that fans' lives were put at risk after video footage emerged of supporters wildly celebrating inside Stadium MK on Saturday.
Video footage emerged on Twitter of hundreds of fans celebrating inside the concourses during Sheffield United's 3-0 win away at MK Dons on Saturday.
Despite warnings from the club that there was a "strict zero-tolerance policy" towards fireworks and flares, fans are seen lighting pyrotechnics inside the stadium.
The footage shows a packed concourse of fans celebrating inside the stadium as a flare is lit and placed on the floor.
A fan is then seen walking across a beam above before dancing and celebrating, as hundreds more fans watch on from the sides.
Sheffield United had already warned that fans who are caught breaking these rules risk prosecution and banning orders.
Following the video footage, Sheffield United's safety officer Jurgen Morton-Hall said that the actions of a few fans put the lives of fellow supporters in danger.
He said: “We obviously do not condone these actions, we would like all our supporters to be able to watch matches in a safe environment, hence our repeated messages of late.
"Each EFL club is responsible for the actions of its own supporters - home or away - and the actions of a minority is putting the lives of fellow supporters in danger as well as potentially putting the club at risk of costly and severe sanctions from The Football Association.”