Three youths were jailed for 18 years each on Friday for murdering a 15-year-old schoolboy stabbed to death at a Tube station.
Promising footballer Sofyen Belamouadden had dreamed of playing for England.
But he was stabbed nine times after pupils from two rival schools clashed at London's Victoria station in March 2010.
Old Bailey judge Christopher Moss gave each a life sentence, ordering they be detained during Her Majesty's Pleasure.
Obi Nwokeh, 19, Christopher Omoregrie, 18, and Samson Odegbune, 18, were told they must serve a minimum of 18 years.
They were also ordered to serve concurrent eight-year detention sentences for conspiracy to cause grievous bodily harm.
Judge Moss said the "ferocious and merciless attack" took place in front of horrified commuters.
He said: "You gathered together for the purpose of serious mass violence in a busy public place at the height of the rush hour."
Judge Moss was sentencing eight youths found guilty of various offences during a series of trials.
He said the 12-second attack on Sofyen had followed a minor confrontation the day before between pupils of two west London schools in the Victoria station food area.
Following messages by text and on Facebook, members of the defendant's school armed themselves with knives and a Samurai sword, expecting the other group to attack their school.
A breakaway group chased Sofyen into the Tube ticket office area and kicked, stabbed and struck him with other weapons as travellers watched in disbelief.
The youths had shown no remorse or acknowledged responsibility for the death, the judge told a packed courtroom.
Sofyen's father, Abdeslan Belamouadden said in an impact statement that Sofyen's death had devastated his family.
He said: "I have no wish to inflict revenge on the culprits but Sofyen, whose life was tragically cut short, would expect justice to take its course.
"I often think of the suffering he must have gone through, that he was set upon with such savagery and why I was not there to protect him."
Adonis Akra, 18, Samuel Roberts, 19, and Femi Oderinwale, 18, were found guilty of manslaughter and given 12 years detention each.
Tyrone Richards, 17, and Enoch Amoah, 19, were found guilty of conspiracy to commit GBH and were sentenced to seven years detention