The crime took place on June 28, according to the prosecutor.
It is suspected that the 16-year-old boy attacked the 12-year-old with a knife, in an unknown place indoors in Skellefteå.
- We suspect that he stabbed the boy repeatedly, prosecutor Andreas Nyberg told SVT Nyheter Västerbotten on Thursday.
Interrogations will now be held with both the 12-year-old and the 16-year-old.
As these are young people, the police and prosecutors may enlist the help of both the Social Services and special child interrogation leaders.
Reviewing alternatives to detention
- We work together with the Social Services to see if there is any alternative to detention when it comes to the 16-year-old, that the Social Services can immediately place him instead.
- We have a clearer picture of what happened now, but much remains to be done, says Nyberg.
The boys are already familiar.
- They know each other.
I do not want to go into whether it is family related or not.
But I can say that they have not lived together, as far as we know, says Nyberg.