A 16-year-old youth has been locked up for life with a minimum term of 12 years for the murder of schoolboy Martin Dinnegan.
The 14-year-old was stabbed four times in the back near his home in Holloway, north London, within an hour of dirty looks being exchanged by two groups of youths.
He was chased by a gang and left dying in the street in June last year.
Joseph Ch
in was last month found guilty of murder by an Old Bailey jury.
Kevron Williams, 17, who was convicted of attempting to cause grievous bodily harm, was given four years in youth detention.
Aftab Jafferjee QC, prosecuting, said teenagers showing off in front of their friends and being prepared to use violence was now a scourge of cities and towns.
He said: "This is such a case, which leads from dirty looks to death in one hour."
Judge Brian Barker, the Common of London, said: "The public have every right to be concerned about the increase growth of this sort of violence.
"It is a tragedy that this sort of triviality caused such a young man to lose his life and has caused enduring heartache to his friends and family."
The judge said: "This was a deliberate attack requiring a long chase with revenge in mind. This was really arrogant group violence and the result is totally unacceptable. It was an attack carried out without any regard to the standards and rules that we live by and no thought for the victim, his friends and his family."
Copyright (c) Press Association Ltd. 2008, All Rights Reserved.
The full article contains 283 words and appears in Press Association newspaper.
