The Metropolitan Police mentioned a 32-year-old girl was in a life-threatening situation in hospital after being stabbed in the course of the occasion.
A 29-year-old man was left with accidents not thought to life-threatening and police had been awaiting an replace on the situation of a 24-year-old man who had additionally been stabbed.
Fifteen officers had been assaulted, though none had been severely injured, and 90 arrests had been made on Sunday, police mentioned.
Arrests had been made for a spread of alleged crimes together with assault on an emergency employee, assault, possession with intent to produce, sexual offences and theft, the police mentioned.
A Part 60 order, permitting police to cease and search anybody within the specified space, was carried out from 6.05pm on Sunday night till 2am on Monday morning, with the second day of the carnival anticipated to be closely flanked by law enforcement officials.
A Metropolitan Police spokesman mentioned: “A whole bunch of 1000’s of individuals got here to Notting Hill Carnival right this moment to take pleasure in a improbable celebration.
“Our officers have been on responsibility working to maintain them secure as a part of a really rigorously deliberate policing operation.
“Regrettably, a minority got here to commit crime and have interaction in violence.”
The principle parade is held on Monday, described by organisers because the climax of the carnival with “get together vibes”.
The carnival is Europe’s largest road get together and is billed by organisers as “the best community-led occasion on the planet”.
Round 1,000,000 individuals are anticipated to attend over the financial institution vacation weekend with about 7,000 officers on responsibility throughout the celebrations.
The police mentioned the order additionally provides officers the ability to demand the removing of face coverings getting used to hide an individual’s id and anybody refusing may be arrested.
Earlier on Sunday, the streets of west London got here alive with color, costumes, dancing and music and 1000’s of revellers loved the celebrations.
Throughout Sunday’s Kids and Households’ Day children had been dancing within the streets alongside the parade route sporting vivid and complex costumes.
The annual celebration of Caribbean heritage, arts and tradition has been operating for greater than 50 years.