It was on January 10 this year that the student is suspected of having attacked a teacher and two students at NTI high school in Kristianstad.
He is first said to have stabbed the teacher, a man in his 50s who was slightly injured.
Then he is said to have turned around and stabbed a student of the same age, who received serious injuries.
Several students have told how the 16-year-old entered the classroom with some form of mask or mouthguard on and played loud music on a loudspeaker.
The text is updated.