A festival in London was marred by violence this weekend as police arrested 454 people.

There were four stabbings, including an attack on a 15-year-old boy, at the Notting Hill Carnival.

The two-day event, which took place over a UK bank holiday, is described as Europe’s biggest street party.

Scotland Yard said there were 156 arrests on Sunday and 298 on Monday.

The majority were for drug offences (169), followed by weapons possession (90), assault (42) and use or supply of psychoactive substances (38).  

A further 13 people were arrested on suspicion of sexual offences.

On Sunday afternoon, a 14-year-old boy was detained over the stabbing of a 15-year-old on Wornington Road in Notting Hill.

The victim was initially described as being in critical condition but is now expected to make a full recovery.

In the second stabbing,  a 20-year-old man was injured on Portobello Road, one of the main streets in the district. His condition is not thought to be life-threatening.

Later that afternoon, two boys aged 15 and 16 sustained stab wounds at Ladbroke Grove.

No arrests were made in either case and investigations are continuing.

In the fourth incident, a man presented himself to officers at Kensal Rise tube station and told them he had received a cut to his hand after being stabbed.

He declined to provide further details and subsequently left the scene, according to police.