SERBIAN ultras conducted a night time raid on their own stadium and repainted seats with an offensive message.
The break-in was inspired by a protest against Partizan Belgrade's board.
The ultras broke into their home Terazije Česma stadium to deliver a message to the boardroom.
The seats of the stadium are usually black, but the ultras painted certain seats white.
That spelled out a message saying: “Management f*** off”.
Schools at risk of closing as teachers prepare to vote on joining strike chaos
It comes ahead of a further protest scheduled for 4pm on Sunday.
The ultras, called "Grabari" have released a statement justifying their actions.
They said: "After the action of Partizan fans during the night, the east stand of the popular "JNA" dawned remodeled and with a clear message and an invitation to a rally on Sunday, June 16 at 4 p.m.
"We are attaching photos of the "work in progress" as well as a photo of how that's what it looks like now, with the view from the renovated central box of the Partizan stadium.
"When the morning dawns, I count the days, when Sunday will come…"
EURO 2024 FREE BETS AND OFFERS
It comes after Serbian ultras have already caused trouble at Euro 2024.
8,000 ultras attempted to storm their nation's open training session ahead of their opener against England.
Fans were seen lighting flares from the stands as the Serbian team trained, with only 3,000 being allowed entry.
It comes as officials have already banned fans from drinking full strength beer ahead of England's opener as they fear drunken violence between fans.
Guardiola picks side on BODY LANGUAGE as he tells Foden why he’s been on bench
England fans are invited to have a lemon shandy or zero per cent option instead.
EURO 2024 LIVE: LATEST UPDATES FROM THE TOURNAMENT