A court had sentenced five teenagers to at least 15 years in detention, following the killing of a 17-year-old identified as Lord Promise Nkenda.
All five denied murder which happened in London but were found guilty on 21 December 2018 following trial.
The court heard how the group used a car they stole as a weapon when they tracked the victim, Promise, down in Canning Town on Wednesday, 14 February.
Promise bravely managed to scramble away from the car which had been driven at him at speed and ran for his life down Butchers Road in the direction of Goldwing Close.
He was pursued by four of the five occupants from the car and stabbed repeatedly in the head, back and chest by the culprits who wore white latex gloves during the attack – reaffirming it as both premeditated and calculated.
A post-mortem examination held at East Ham Mortuary on Thursday, 15 February gave cause of death as stab wounds to the chest.
Officers then commenced a meticulous investigation which included spending hours viewing and reviewing CCTV images of the defendants along with the retrieval and analysis of DNA evidence.
The court heard that the car used by the killers was carjacked from a woman in Fairland Road, E15 at approximately 18:00hrs.
The stolen BMW which was used as both a battering ram against Promise and as an escape car following the stabbing and would later be found crashed in Victoria Dock Road.
Incriminating evidence was found in the boot of the car by investigators.
A knife and pair of latex gloves were later discovered behind a nearby telephone junction box in the crime scene and forensically linked to the attack.