Footage has emerged of Manchester United and Manchester City fans brawling in the city centre following Saturday's frantic derby at Old Trafford.
Pep Guardiola's side produced an outstanding first-half display at the home of their rivals, and they withstood a spirited fightback from United to win the match 2-1.
However, tensions amongst fans spilled over after the derby and the ugly, violent scenes have put a dampener on what was a pulsating game and the first Premier League meeting between Guardiola and Jose Mourinho.
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Initially, two men squared to each other, but before long, more than a dozen people were brawling and fighting in the streets of Manchester before police arrived in the Northern Quarter area and the thugs dispersed.
As you can see in the video below, rival hooligans weren't holding back and they used a variety of roadside objects; from crates and signs to chairs and tables, as weapons and several people were seen filming the incident on their phones.
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Over 75,000 supporters were inside the Theatre of Dreams to watch the match, and the police claim that the showpiece occasion passed "largely without issue", however some people were arrested.
Five arrests were made, including two men for affray and another for ticket touting. Those three people have all remained in custody, but two men who were arrested for breach of the peace were released.
What have the police said?
It hasn't been confirmed whether any of the arrests were linked to the brawl in the Northern Quarter, but Chief Inspector Dean Howard, the match commander, has responded to events surrounding the Manchester derby.
"There was a lot of excitement surrounding today's game and I want to thank the fans as well as local residents for their co-operation today," he said.
He continued, "This match was the first derby of the season and although we have a lot of experience policing high profile football fixtures, your support does make all the difference.
"Apart from a handful of arrests, the vast majority of supporters were a credit to their teams and enjoyed the match in a safe environment for all."
What do YOU make of the violence between United and City fans? Leave YOUR opinion in the comments box below!