THIS is the shocking moment a yob wielding a huge blade is pinned down and knifed in a broad daylight attack.

Cops have arrested four teenagers after the horror unfolded at Burgess Park in Camberwell, South East , yesterday.

Two individuals engaged in an altercation with weapons in a park.One of the alleged attackers holds down another man Credit: X/@COOLDJGABA Two people on a pathway in a park, one is crouched over a third person on the ground, while the other stands nearby, and a caption that reads "This is London".The violent clash continues for 20 seconds Credit: X/@COOLDJGABA

Shocked bystanders – seen watching on from behind a temporary metal fence – can be heard shouting and screaming during the attack.

Two youths are initially shown tussling with large blades, before one of them slips and falls to the floor.

A third person then appears in shot, before grabbing the alleged target and proceeding to pin him to the ground.

The alleged attackers appear to land numerous blows with their knives, while the man on the ground attempts to wrestle free.

Two people fighting in a park.The man wrestles to break free as he is pinned to the ground Credit: X/@COOLDJGABA Two individuals engaged in an altercation in a park.Two youths are initially shown tussling with large blades Credit: X/@COOLDJGABA

The violent clash between the three men – all sporting dark coats and hoods – continues for around 20 seconds.

Moments later, a heroic passerby runs in to break up the violence, pushing one of the alleged attackers off and scaring the other away.

He separates the pair, before checking in on the man on the ground, who continues to hold onto the large blade as he gets up.

After being released, he then runs towards a nearby e-scooter and seemingly rides off in the same direction as his attackers.

The horrifying 40-second clip was initially posted on social media yesterday.

It was shared with the caption: “This happened today 17/05/26 in Burgess Park, SE London, where I play every Sunday morning.”

“The knife in London is alarming, the man who separated those boys deserves a medal, he saved a life”.

The confirmed four teenagers were arrested in connection with the shocking attack.

An altercation involving multiple individuals in a park with buildings in the background.A heroic passerby later runs in to break up the violence Credit: X/@COOLDJGABA A man on an e-scooter swerving to the left, with the text "This is London" overlaid on the image.After being released, he then runs towards a nearby e-scooter and rides off Credit: X/@COOLDJGABA

Officers received reports of the altercation at around 12.30pm, the force said.

A helicopter was later drafted in as police combed the area, before three teens were arrested near the scene.

The fourth suspect was arrested after arriving at hospital for treatment.

The boys, aged 16 and 17, were arrested on suspicion of offences including causing grievous bodily harm and possession of an offensive weapon.

A spokesperson told The Sun: “Four boys, aged 16 and 17, were arrested on suspicion of offences including affray, causing grievous bodily harm and possession of an offensive weapon.

“Three boys were arrested near the scene, while a fourth was arrested later on Sunday evening. All four boys remain in police custody.

“Two of the boys who were arrested were reported to have suffered injuries in the incident, which were not life-threatening or life-changing.

“One, a 17-year-old boy, self-presented at hospital for treatment to wounds and was discharged later that afternoon, following which he was arrested at a property in Southwark.

“The second boy, a 16-year-old, was taken to hospital by police and was later discharged.

“Anyone with information is asked to contact police on 101, quoting CAD 3298/17MAY or Crimestoppers, anonymously, on 0800 555 111.”