The men were convicted on Thursday - 9th July 2009, for killing 20-year-old Ramanan Vivekananthan in Oslo on 12 August 2007.
The political motivated group involved in the attack, which consisted of around 10 men, traveled from France and Germany to Kalbakken area in Oslo, specifically to attack the Mr.Ramanan armed with samurai swords, pickaxe handles, guns and other weaponry.
Once in Oslo they ambushed a group of six men in Kalbakken, area.
The victim was struck on the head and body by a Gun shot, and when he fell to the ground both 'Jaffna ganger' and 'Psycho' attacked him with the swords attempting to behead him.
While the five were found guilty of murder charges, were the five other convicted for bodily under particularly aggravating circumstances, and with the fatal result.
The incident was a culmination of an almost two-year-old conflict between two rival gangs in the Tamil community in Oslo.
It involved a planned settlement, and several of the accused was obtained from abroad as "reinforcements." In the Court's ruling states that "the murder was carried out in a brutal and ruthless way, the more the community, and by the use of particularly dangerous weapons, and against a 19-year-old boy who was killed on the ground."
Some of the men convicted had fled Norway, and the Norwegian police tracked the criminals down as far as France.
One of the men found guilty was arrested at his place of employment in France. He worked at Disneyland, Paris.
Two Sri Lankan men arrested for rape in the UK
Australian police charge Tamil man for racially motivated attack
Four Sri Lankan Tamils plead guilty to terrorism charges in the US
Canada is not doing enough to protect Sri Lankans from the Tamil Tigers
Tamils attack Sri Lankan Buddhist monk in Britain
Video: Tamil Ethnic Violence and Immigration in Australia - Alan Jones