It was on July 15 that Reza Hosseini was killed with more than 90 stab wounds on a parked bus in central Kiruna.
On board the bus sat eight other people who were forced to watch as the 20-year-old was killed in front of them.
Kept behind closed doors
Today, the trial, which is expected to last, albeit hacked, began for eight days.
A 47-year-old father and his two sons aged 15 and 17 are suspected of murder, the sons are also suspected of assault in court.
However, Luleå District Court decided to conduct the trial behind closed doors with reference to the young age of those involved.
Claims self-defense - received no injuries
The suspect's father's defense lawyer, Frida Larsson, believes that the father should be acquitted completely as he only used self-defense.
The 15-year-old admits the act but also claims self-defense.
But prosecutor Lindha Strömberg does not buy their statements.
In the video above, you hear why and why prosecutors can establish that at least two knives have been used.