Images emerged of a policeman appearing to hit a Manchester United fan multiple times as he lay on the ground being arrested.
On Sunday, supporters clashed with police outside the Lowry Hotel in Manchester, as fans protested against United owners, the Glazer family.
Around 200 fans are said to have gathered at the hotel where the United team were staying and blocked exits to prevent them from making their way to Old Trafford, where other protests were taking place.
In exclusive footage taken from outside the hotel, officers can be seen dragging a young man behind a police van before holding him to the ground and telling him to “stop resisting”.
One of the policemen then appeared to hit him more than once in his midsection before getting up and pushing back other civilians who were filming the incident.
The officer can be heard shouting “come back now”.
The person filming the incident replies, “No need to touch me. I’m coming back.”
The policeman then shouts: “Do what I say”, to which the filmmaker replies: “I do what you say, no need to touch me”.
Before the arrest, a small number of fans appeared to stop a truck in the middle of the street and the footage then shows them protesting with the driver, who had gotten out of the vehicle.
An eyewitness told Mirror Sport: “There was a fairly large police presence. They pushed the protesters onto the main road to prevent them from getting off at the Lowry Hotel where the players were.
“Everything went well until the fans found out the game was off, who then started turning the page on the police, started throwing bottles, lighting smoke grenades.
“They were blocking the cars, running over them, kicking them, and then the truck got to where it all started. They were blocking it. The driver got out, tried to confront them.”
A second eyewitness to the scene told Mirror Sport: “What started this incident, I believe, was that a truck was trying to pass and basically the protesters were not letting the truck pass. The driver is out and two protesters start to climb to the front of the truck. “
It was at this point that the officers swooped in to make their arrest.
The second eyewitness then claims that the police acted differently towards him when the individual was arrested.
“I had had a good relationship with the police all day,” he said. “They had no problem getting me as close as I wanted to them, their lines and crossing them. At this moment [of the arrest] I was forced to get away from what was going on. “
Discussing the protest, he added: “A lot happened. Protesters were throwing flares and bottles at the police. I saw them kicking the buses that were trying to pass, preventing traffic to pass.
“The place was an absolute tip when they left, the place was just broken glass, flares, trash, bottles, all over the floor where they were.”
“They kept trying to get closer to the Lowry Hotel where the team was staying.”
Mirror Sport contacted Greater Manchester Police for comment, who issued the following statement: “We are aware of a video circulating online of police officers making an arrest during a protest today (2 May) near the Lowry Hotel.
The video shows officers arresting a 28-year-old man on suspicion of motor vehicle theft and public order. He is currently being held for questioning.
“GMP’s Professional Standards Department has been made aware of the video and will review the footage and all available evidence to understand all of the circumstances surrounding the arrest.”
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Meanwhile, at Old Trafford, fans broke into the stadium hours before the Premier League clash between Man Utd and Liverpool.
Thousands of people had turned up to express their displeasure with the Glazers, and many made their way to the pitch, where corner flags were removed and broadcast cameras were reportedly smashed.
Some even entered the building, after police twice attempted to secure the stadium.
Outside police clashed with fans in gruesome scenes as bottles were thrown at police officers, two of whom were injured.
The game was delayed by more than an hour before the Premier League, with both clubs and authorities taking the decision to postpone it.