Five teenagers were given long sentences of detention today for killing a 15-year-old boy who was stabbed to death as he arrived at school.
Four of the youths were found guilty of murder and one of manslaughter last month.
The Old Bailey heard that within moments of being hounded down, Zac Olumegbon lay dying on his back in the garden of a house just metres from the school.
He had been stabbed four times, two of the wounds piercing his heart.
The killers, who were aged 15-16 at the time, killed Zac outside Park Campus School in West Norwood, south London, in July last year.
Helder Demorais, 18, Ricardo Giddings, 17, Jamal Moore, 17, and Kyle Kinghorn, 18, were found guilty of murder and ordered to be detained during Her Majesty's Pleasure.
Giddings was given a minimum term of 18 years, Kinghorn 16 years, Demorais 16 years and Moore 14 years.
Left to right: Helder Demorais, Ricardo Giddings
Shaquille Haughton, 16, was found guilty of manslaughter and was detained for eight years with an additional four years for wounding Zac's friend, making a total of 12 years.
The youths, who were all from south London, all had a previous conviction for having a bladed article.
Judge Giles Forrester told them: "This was gang related, going together to hunt down your victim like a pack of hounds.
"It was a vicious, shocking and sickening case of violence outside a school at a time when pupils and staff were gathering at the start of a school day."
Left to right: Jamal Moore and Kyle Kinghorn
Zac had been "mercilessly" chased as he "fled for his life".
"There were two young victims, each stabbed outside or near his school at a busy time for pupils and teachers alike," added the judge.