A "hunting posse" of teenagers stabbed a 15-year-old boy so ferociously the blade of a large knife they were using snapped, a court has heard.
Negus McLean was killed during a so-called "post code war" in north London, a jury at the Old Bailey was told.
Billal Lariba, Brandon Hamilton, both 18 and from Enfield, Tershan Edwards, 19, from St Albans, Hertfordshire, and a youth, 16, deny murder.
The court heard there were three stabbings over the feud in a week.
The first two victims involving rivals from the Enfield EN3 Get Money Gang and Edmonton N9's Dem Africans group, survived.
But Negus, a member of DA, died from his injuries following the attack.
He had been riding his bike when he was spotted, chased and killed.
Simon Denison, QC, prosecuting, said: "A group of seven boys from the GMG gang rode out of EN3 on bicycles, like a hunting posse, south into N9, in order to carry out that attack.
"Negus came off his bike and he was attacked. He was knocked to the ground and repeatedly stabbed in the chest and in his legs.
"A metal knife that was used to stab him was driven down into him with such force that the blade snapped off the handle."
Mr Denison went on: "Negus was left lying on the pavement, blood pouring from his wounds.
"He lost a lot of blood very quickly and died that evening in hospital."
The stabbing happened in Westminster Road on 10 April 2011.
The trial continues.