The 15-year-old boy from Haringey continues fighting for his life after he was stabbed last weekend.
Three men, aged 20, 24 and 17, were arrested on suspicion of attempted murder on the evening of August 30, in addition to a 21-year-old man who was arrested early in the day of August 31. All four men have been released while further investigation takes place.
The victim has received immediate treatment from medics at the scene, before being taken to an east London hospital where he remains in critical condition.
Detective Inspector Paul Ridley of North Area criminal investigation department (CID) is leading the investigation and has appealed for further assistance. He said: “This was a savage and sustained attack on a young boy in broad daylight. The investigation team have been working relentlessly over the weekend to piece together the events of Friday morning and will continue to do so at pace.
“We now believe that a yellow bicycle the attacker was seen fleeing on belonged to the victim. This was found abandoned nearby in The Avenue.
“The sole assailant, described as a black male, made off along Willan Road towards The Avenue. I would ask that if you have any dash cam footage from your vehicles or any private CCTV which you believe may show the attacker, then please contact my team.
He added: “I am convinced that someone knows who is behind this attack. I would reach out to family members, friends and associates to come forward. If he has confided in you, I need your assistance. I assure you that all information will be treated in confidence. I just need a name.”
Anyone with information is asked to call police on 101, quoting: 2902/30Aug or Tweet @MetCC.
Alternatively, to share information anonymously without contacting police, call the independent charity Crimestoppers on 0800 555 111.