A teenage gang member who stabbed a younger rival to death after luring him into a council estate has been jailed for life.
Sarpong's victim was stabbed through the heart
Abu Sarpong, 18, stabbed 15-year-old Alex Kamondo through the heart with a kitchen knife on the Ethelred Estate in Kennington, south London.
The attack, in June last year, was carried out with such force that the blade broke, the Old Bailey heard.
Sarpong, from Kennington, was found guilty of murder at an earlier trial.
Judge Gerald Gordon sentenced him to youth custody for life with a minimum term of 14 years.
Judge Gordon said: "It is the carrying and use for minuscule motives of such a knife which is causing death and devastation to families and that has got to stop."
The two youths belonged to rival gangs in the area.
Alex Kamondo was a member of the Man Dem Crew
Alex was pictured on the internet holding a sawn-off shotgun with members of his gang, the Man Dem Crew.
The gangs, based around local housing estates, had been involved in a minor confrontation hours before the killing.
Alex's gang returned to the area in the evening and was lured into the Ethelred Estate, Kennington, where Sarpong's gang was waiting.
After the sentencing Alex's father Kamondo said justice had been done and urged young people to stop carrying guns and knives.
"All weapons are no good...we need to fight to stop that."
Alex's cousin Ginette Kafe said: "The government, other young people, carers, role models need to come together to tackle this crime.
"Young people are the future for tomorrow and these young people are dying."