Arsenal fans have launched an urgent appeal after supporter Gavin Cox was reported missing following the match at West Ham.
The Gunners won 5-2 at the home of their London rivals in the 5:30pm kick-off on Saturday.
Goals from Gabriel Magalhaes, Leandro Trossard, Martin Odegaard, Kai Havertz and Bukayo Saka saw Mikel Arteta’s side well clear before the break, leading to an uneventful second half.
And a post from friend George Cole-Fletcher confirmed Mr Cox left the London Stadium after 70 minutes.
An appeal read: “ARSENAL COMMUNITY, URGENT APPEAL!! Has anyone seen Gavin Cox pictured, he hasn’t made it home after the game yesterday and left on the 70th minute and car hasn’t moved.
“Very out of character and we are all worried sick! Car was left at Cheshunt station. Well known at the Arsenal.”
In a separate post, Mr Cole-Fletcher revealed Mr Cox’s phone has been switched off since the match.
While Hertfordshire Police have since made a separate appeal, urging people to call 101 with information or 999 if anybody is currently with Gavin.
A post read: “Have you seen #missing Gavin, aged 44, from #Cheshunt? Last seen at 7.15pm yesterday (Sat 30 Nov) in #Statford #London. Last seen wearing grey cargo trousers, grey hoodie, black hooded gilet.”
The match at the London Stadium unfolded alongside a fiery atmosphere with supporters clashing in the stands during the game.
The Hammers confirmed they have launched an investigation after multiple fights broke out with stewards rushing to swiftly break up the violent clashes.
A West Ham spokesperson told The Sun: “The club is aware of the incident and will be working to identify the offender(s).
“In line with our zero-tolerance approach, anyone identified will have their details passed to the police and will be given an indefinite ban and therefore be unable to enter London Stadium and travel with the club. There is no place for this kind of behaviour at our Stadium.”