EDL co-founder Tommy Robinson has claimed Celtic fans attacked woman and children in a shop in Sunderland where he was signing books.
Robinson posted a video to his Facebook , seemingly in the aftermath of an incident, which also shows a man wearing a Celtic strip on the ground being treated by police officers.
The EDL co-founder, wearing a Rangers top, claims in the video Celtic fans "armed with flares, bricks and missiles ... attacked woman and children in a shop."
He also claims the man on the ground had been "put to sleep" on a union jack pillow after the incident and that the man had used his belt as a weapon.
Robinson earlier in the day recorded a video message to Hoops fans making the trip down south for the club's friendly fixture against Sunderland in which he branded fans' group the Green Brigade' muppets.
Alternative footage from before the match shows rival fans clashing on the street, with bottles being thrown and police having to separate supporters.
Meanwhile the local ambulance service confirmed a man has been 'seriously' injured following the clashes.
A North East Ambulance Service spokesperson said: “We received a call from police at 1.57pm today to reports of a disturbance in Sunderland.
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“Fortunately, there was only one casualty. One male suffered head injuries and was in a serious condition.
“He was taken to hospital and his injuries do not appear to be life threatening.”
Northumbria Police issued a warning to fans during the game.
A spokesman said: "We will not tolerate disorder inside or outside the stadium and we will have a highly visible policing presence at the Stadium of Light and surrounding cities."
"Police action will be taken against those disturbing the peace and threatening the safety of themselves and others."