Twenty-four people were arrested, and 75 were rescued from heights at the Arsenal celebration parade, emergency services confirmed.
Thousands celebrated in the streets of north London as Arsenal held a bus parade to celebrate winning the Premier League this season.
The Metropolitan Police confirmed that 24 arrests were made, 10 of which were for assaulting officers. Arrests were also made for drunk and disorderly behaviour, drugs offences, sexual assault and assaulting emergency workers. The Met also dealt with other assaults and unlicenced music events in the area.
They also confirmed that officers dealt with six stabbings later in the evening after crowds had mostly dispersed. Most of the victims were not seriously injured, they said.
However, they said: "One man in his 20s was initially taken to hospital in a life-threatening condition after being stabbed shortly before 20:30hrs in Hornsey Road, N7. Fortunately, he is now in a stable condition."
The London Fire Brigade's Assistant Commissioner Pat Goulbourne, who was the strategic commander for the parade, said: "Arsenal's Premier League title celebrations have been a fantastic sight and it has been great to see so many fans celebrating their club's achievement safely.
"Throughout the afternoon, firefighters, including those strategically resourced for this huge event, have responded to several incidents within the vicinity of the parade, including leading and rescuing approximately 75 people from incidents at height. We ask people to refrain from climbing onto rooftops and other structures as celebrations continue into the evening.
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"We also attended a fire at a hotel, believed to have been caused by a stray flare where we used one of our 32-metre Turntable Ladders to help extinguish the fire. Fortunately, the fire caused only a small amount of damage to the exterior of the building. Pyrotechnics are also believed to have triggered the fire alarms at several other locations in the area.
"As supporters head home, we would urge them to avoid using pyrotechnics, particularly at stations, and to keep them away from buildings and other flammable materials."
The parade took place a day after Arsenal fell short in the Champions League final, losing on penalties to Paris Saint-Germain after a 1-1 draw.