Reported crime at this year's Notting Hill Carnival is "significantly down" on last year's event, police said.
Chief Superintendent Michael Johnson said: "Early indications from yesterday are that crime is significantly down on last year, but we never like to put that out in the public domain without knowing exactly what those figures are.
"It is very difficult because some people won't report it (crime) until they get home."
Arrests are at about the same level as last year, with 85 today as of 6pm - including 44 for drugs-related offences.
Scotland Yard said there were just under 100 arrests yesterday.
Captured on YouTube - policemen dancing at Notting Hil Carnival.
Entertainers have been putting their elaborate costumes on show at Notting Hill Carnival for a second day.
More than a million people are reported to have turned out to watch them parade through the streets of west London.
Notting Hill Carnival will continue its loud explosion of colour and music for a second day. Sunshine is predicted to heat up the Bank Holiday Monday celebrations with temperatures of up to 26C (78.8F) forecast for London.
The total number of visitors to the two day festival is estimated to reach one milliion by the end of the day.
Scotland Yard said police have made around 93 arrests at this year's Notting Hill Carnival.
The arrests were made mainly for drugs offences - while London Ambulance Service and St John Ambulance treated more than 300 people for cuts and bruises to their feet and alcohol-related injuries. A spokesman said 45 were taken to hospital.
A damp start couldn't stop hundreds of thousands of people turning out for this year's Notting Hill Carnival.
Everyone seemed to be having a good time including a dancing policeman who was filmed enjoying the carnival atmosphere.
Up to one million people are expected to attend the Carnival to experience Caribbean culture, food, music and dance.
Thumping basslines, sizzling meat and tooting whistles filled the air as giant floats made their way from Westbourne Park Underground station, up Kensal Road, along Ladbroke Grove and down Westbourne Grove in West London.
One of the first groups to take to the streets was the charity Kinetika Bloco, whose dancers wore pink, green and white costumes while a brass band played songs from The Clash's Rock the Casbah to Daft Punk's Get Lucky.