The Notting Hill Carnival has seen 440 people arrested and four people wounded in stabbings during the annual two-day celebration.
Scotland Yard said 156 arrests were made on Sunday, with 284 following on Bank Holiday Monday.
The majority were made for possession of drugs or weapons offences.
On Sunday a 15-year-old boy was stabbed in Wornington Road and a 14-year-old was arrested. The teenager's injuries were non-life threatening.
Three other males, aged 15 to 20, were also wounded in knife attacks at the opening day of the festival.
The making of the Notting Hill Carnival
Police said they had seized 26 knives while patrolling the event.
Officers also seized a large canister of compressed nitrous oxide - the so-called laughing gas - which had the capacity to fill 2,500 smaller canisters and had a street value of more than £150,000.
Ambulance and first aid crews treated more than 1,000 people, mostly for alcohol-related injuries.
The carnival is one of Europe's largest street parties with hundreds of thousands attending each year.
It has been held since 1964 as a way for Afro-Caribbean communities to celebrate cultures and traditions.
Sunday's festivities included the traditional Children's Day parade through the streets of west London as part of the event's family day.
Carnival-goers continued dancing at the street party came to a close on Monday.