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A video posted online shows Hoops fans gathering outside Fletcher's off licence in Sunderland, ahead of Celtic’s friendly with the Black Cats today.

Former EDL-leader Robinson had earlier posted a video taunting Celtic fans on Twitter – calling them "muppets".

He then uploaded a picture of himself inside the shop – wearing a Rangers football shirt.

Police have arrested 19 people after clashes between Celtic and Sunderland fans.

The clip shows a burst of smoke coming from the group outside the shop – suggesting they tried to put a flare or firework through the letter box – before the gang splits.

Robinson accused the Celtic fans of attacking him with "flares and missiles".

Another group then confronts the Celtic fans – apparently pelting them with missiles – before a street brawl starts.

Pictures posted online show a Celtic fan on the ground with blood pouring from his head – lying on a Union Flag pillow.

(Image: TWITTER)

Rumours circulated online that Robinson had been injured, after Northumbria Police put out a statement saying the off licence had been attacked – and a man was in hospital with a “head injury”.

But Robinson has posted a video Twitter of him taunting the injured fan and his pals.

“How’s your mate?” the far right firebrand asks men attending to the downed lad.

Celtic and Sunderland fans clashed elsewhere ahead of the friendly at the Stadium of Light.

Police were called to reports of bottles being thrown outside of the Deaf Centre in North Bridge Street at about 1.50pm.

Dramatic pictures show mounted police and dog units attempting to keep the two sets of supporters apart.

Several men appeared to be hauled away by officers.

A video posted on social media shows one fan wandering in the street with a gash in his head.

The violence comes after Celtic and Linfield supporters clashed during a UEFA Champions League qualifier earlier this month.

Meanwhile, Robinson was caught on camera battering a bloke at Royal Ascot last month.

(Image: TWITTER/TOMMY ROBINSON)

A Northumbria Police spokesman said: “Police are dealing with an incident in Hendon, Sunderland.

“At approximately 1.40pm today, police received reports of at Fletcher’s Off Licence in Hendon.

“Police and paramedics attended the scene after damage was caused to the off licence and allegations of assault were reported.

“A man has been taken to hospital with a head injury.

“Police inquiries are on-going to determine the circumstances around the incident.

“Police are reminding all Sunderland and Celtic fans that any form of disorder, violence or any behaviour that endangers the public will not be tolerated and police action will be taken.”

In a separate statement, a force spokesman said: "At approximately 1.50pm, police received reports of bottles being thrown outside of the Deaf Centre, North Bridge Street in Sunderland.

"The incident involved both Sunderland and Celtic football fans.

"Police arrived on scene and dispersed the growing crowd."

Assistant Chief Constable Helen McMillan, of Northumbria Police told Daily Star Online: “Fans come here to enjoy the football; many with young children and we here at Northumbria Police do all we can to ensure they enjoy the day whichever team they support.

“Unfortunately we did have some incidents of disorder in and around Sunderland between Sunderland and Celtic fans and while police dealt with them quickly, it is a shame these types of incidents happen at all.”

A spokesman for the North East Ambulance Service said: “We received a call from police at 1.57pm today to reports of a disturbance in Sunderland.

“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.”