Hooligans who stormed the pitch at Old Trafford then shared videos of themselves online as they snorted white powder from the stolen corner flag.
In shocking scenes on Sunday night, protesters clutching cans of Strongbow and a sign reading Glazer Out invaded the pitch and attacked police amid ugly clashes ahead of Manchester United s game against Liverpool.
Afterwards they filmed themselves as they scaled a phone box before emptying a bag of white powder onto the stolen flag pole and sniffing it off.
The video was shared on Snapchat alongside a laughing emoji and a caption reading: Striped off the flag.
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An officer whose face was slashed during a protest by Manchester United fans suffered life-changing injuries and is incredibly lucky not to have lost sight , police say.
The planned match against Liverpool was dramatically called off yesterday after anti-Glazer protesters got onto the Old Trafford pitch and clashed with police outside the stadium, as fans tried to blockade a hotel to prevent the United team from leaving for the game.
Police said one of the officers injured during a protest by Manchester United fans on Sunday suffered life-changing eye injuries, having sustained a significant slash wound to the face during the unrest.