Two further arrests have been made as detectives investigate the murder of a 15-year-old boy.
The 21-year-old was arrested on suspicion of murder and the 25-year-old was arrested on suspicion of assisting an offender.
Both suspects remain in custody at a north London police station.
Police were called to reports of a stabbing at Willan Road, Haringey on August 30 at 11:14am, the victim was found suffering multiple stab wounds before he was taken to an east London hospital.
Detective Chief Inspector Neil John, who is leading the investigation, said: “Our investigation continues to make progress as shown by these latest arrests.
“Perry was attacked in broad daylight and I would continue to urge anyone who has information about what happened to come forward.
“This was a sustained assault which led to a teenage boy losing his life.
“We are determined to find the individual responsible for this murder and we believe he fled the scene on a yellow bicycle which was alter found abandoned nearby in an alleyway.”
The chief inspection added: “We would urge anyone with dashcam footage which may show the attacker or the incident itself to come forward.”
Anyone with information is asked to call police on 101 quoting 2909/30AUG or Tweet @MetCC or call the incident room on 0208 358 0100.