Four stabbings have been reported on Notting Hill Carnival's first day, which is dedicated to children and families.
An unnamed man was left fighting for his life after emergency services were called to Wornington Road in Kensington and Chelsea this afternoon. Scotland Yard said it had arrested a man on suspicion of causing grievous bodily harm.
Minutes after the first incident, officers were called to reports of another stabbing on Portobello Road, and within the hour two more men were taken to hospital following a double stabbing on Ladbroke Grove.
Despite the revelry, it was still a day of hard work for the emergency services as the London Ambulance Service said it had treated 345 patients and taken 43 to hospital by 7pm.
The Met introduced advanced security measures to help police the event this year, including a facial recognition system. However, Scotland Yard said it had arrested 71 people over the same time for a variety of alleged offences.
These included two alleged sexual offences, 50 drugs offences, 20 counts of possession of offensive weapons, four counts of actual bodily harm, two of grievous bodily harm, one alleged theft and one public disorder.
Carnival will continue tomorrow with its Grand Finale day.