Two police officers was hurt as violence overshadowed the second day of the Notting Hill Carnival.
A male PC, 33, was taken to hospital after being attacked during the event in West London, having been alerted to suspected drug dealing.
He was found in Lancaster Road at the junction with St Luke's Road at around 3.15pm yesterday with injuries to the head and torso, which are not thought to be life-threatening.
Meanwhile colleagues came under attack when they came to help him, and a 35-year-old female officer suffered injuries to her torso. She was taken to hospital but released yesterday, Scotland Yard said.
A man has been arrested for affray.
Grey skies and rain could not dampen the colour as the Notting Hill Carnival wound its way through the streets of west London.
Thousands of people are expected to attend the final day of this year's Notting Hill Carnival.
The "adult day" of the annual festival will see 60 bands perform with costumed performers parading on the streets.
Some 7,000 police officers will be on control to "facilitate a safe and vibrant carnival".
Revellers attending the carnival's family day yesterday praised the event's atmosphere, saying it was "brilliant fun".
Hundreds of thousands of revellers joined Europe's biggest street party today as the Notting Hill Carnival ended in an explosion of colour.Read the full story ›
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.