More than 100 people were arrested on the first day of the Notting Hill Carnival, and five people were stabbed, police have said.
Four people, including two 15-year-old boys, were stabbed during the space of just over half an hour on Sunday (August 28) afternoon.
A 14-year-old boy was arrested for GBH following the stabbing of another teenager, whose injuries were initially thought to be life-threatening.
There had been a total of 105 arrests as of 10pm on Sunday, according to figures from the Met Police, including two for GBH and four for sexual offences.
The vast majority of arrests were for drugs offences (74) or for possession of a knife (24), with some people arrested for more than one offence.
Police said five people had been stabbed - four of them in the space of just over half an hour - in the following four incidents.
Police were called to reports of a stabbing in Wornington Road at 4.25pm.
A 15-year-old boy was taken by ambulance to a central London hospital. His condition was critical but is no longer believed to be life-threatening.
A 14-year-old boy was arrested on suspicion of GBH and taken to a central London police station. Police said enquiries are ongoing.
Police were called to reports of a stabbing in Portobello Road, at the junction with Munro Mews, at 4.28pm.
A 20-year-old man was taken to a central London hospital, where police said his condition is not life-threatening.
No one has been arrested and enquiries continue.
Police were called at 5.09pm to reports of a stabbing in Ladbroke Grove at the junction with Treverton Street.
A 16-year-old boy and a 15-year-old boy were found with stab wounds and taken to a central London hospital.
Police said neither boy's condition was believed to be life-threatening, and no arrests had been made.
A man presented himself to officers at Kensal Rise tube station and told them he had been stabbed resulting in a cut to the head.
Police said he declined to provide further details and subsequently left the scene. Enquiries are ongoing.