An Arsenal supporter was involved in a dramatic altercation at the London Stadium on Sunday after appearing to celebrate among West Ham fans during the Gunners' crucial Premier League victory.Mikel Arteta's men edged closer to a first league title since 2004 thanks to a late strike from Leandro Trossard, securing a tense 1-0 win over their London rivals.The result means Mikel Arteta's side now need victories over Burnley and Crystal Palace to seal the Premier League crown.While around 3,000 Arsenal supporters celebrated in the designated away section, footage widely shared on social media appears to show a separate incident involving a fan in one of the home areas.TRENDINGStoriesVideosYour SayThe video, which GB News has seen, seems to show a male spectator being pursued by several individuals before falling down a flight of stairs in the upper tier of the stadium.It is currently unclear if the man sustained any injuries.Social media users claimed the individual had been sitting in the home end and had angered nearby supporters by reacting to Arsenal's late winner.Football clubs routinely discourage away fans from purchasing tickets in home sections because of the heightened risk of confrontation when emotions run high.GB News has contacted both West Ham and the Metropolitan Police for comment.The incident came at the end of a hugely contentious afternoon in east London, with the match itself overshadowed by a dramatic VAR intervention deep into stoppage time.LATEST SPORTS NEWS:Kylian Mbappe sparks furious backlash with social media post after missing Barcelona win over Real MadridLuke Littler puts dream career move on hold because of girlfriend Faith MillarRory McIlroy gives PGA Championship update after major injury scareWest Ham believed they had snatched a vital equaliser when Callum Wilson fired past David Raya.But celebrations were cut short after a lengthy review.Officials concluded that Pablo Fornals had impeded Raya in the build-up, leading referee Chris Kavanagh to disallow the goal after consulting the pitchside monitor.The decision sparked furious reactions from the home crowd and left West Ham players incensed.Former Manchester United goalkeeper Peter Schmeichel was among the most outspoken critics."That decision today is just so wrong on so many levels," he said on Viaplay. "What really makes me angry is that Arsenal would never be top of the league if that's a free kick."He added: "When you look at the screen for five minutes, you'll find something."West Ham captain Jarrod Bowen also questioned the consistency of officiating."Because we're on the receiving end, we're going to feel hard done by," he said. "If you're going to give it, you have to give it to every single one that happens week in, week out. Where's the consistency?"Bowen continued: "When you look at the screen for five minutes, you'll find something. I'm sure if you look long enough, you'll find something. Do I think it's the right decision? No."Arsenal, meanwhile, held on to claim three potentially season-defining points.Had they drawn, the title race would have tightened considerably. Instead, the north London side remain firmly in control of their own destiny as they chase a historic Premier League triumph.Our Standards: The GB News Editorial Charter