Three gang members have been jailed for life for the murder of a teenager which was captured on CCTV.
Mr Osman suffered three fatal stab wounds during the attack
The images of Mahir Osman, 18, being attacked by at least 30 people in Camden, north London in January 2006 were shown to the Old Bailey jury.
The CCTV images showed Mr Osman, from Hampstead, north London, being punched, stamped on and stabbed 20 times.
Five other defendants also received jail terms. None of the eight can be named for legal reasons.
Two of the killers, both aged 20, were sentenced to life in prison with minimum terms of 15 and 14 years.
Another, aged 17, was sentenced to life with a 10-year minimum term.
Judge Stephen Kramer said the attack was an example of a gang culture "all too prevalent" on the streets of London.
A 25-year-old man was jailed for five years for conspiracy to wound with intent and violent disorder.
An 18-year-old man received four years detention for conspiracy to possess offensive weapons and violent disorder.
Three other people, aged 16, 17, and 18, were handed five years detention for conspiracy to wound with intent, conspiracy to possess offensive weapons and violent disorder.
The court had heard how the attack had been the culmination of escalating violence involving two Somali gangs from Camden and the Tottenham-Edmonton area.
The jury had watched in silence as youths carrying wooden bats, bottles, hammers and knives assaulted Mr Osman near Camden Tube station.
'Loving and caring'
He was left rolling about in the road as his attackers ran off and tried to get away on a number 253 bus before it was stopped by police, said Brian Finucane QC for the prosecution.
Judge Kramer added that gang culture created senseless violence which members of the public were forced to endure "simply because they are innocently and lawfully out and about".
Mr Osman's father Abdi Rahman said his son came from a "religious, loving and caring" family.
In a statement he said: "There are no words that can describe the hurt and heartache that we are feeling now and will do forever for the future."