- I know that some individual students who allegedly used drugs are investigating, says Maria Kjällström, school director in Karlstad.

She says that the municipality and the school are investigating the events that have taken place in collaboration with the police and social services.

- We want to show, there is zero tolerance for drugs and zero tolerance for violence. You should feel safe with us. And we always make a police report when we suspect a crime has been committed, she says.

According to Maria Kjällström, there is no direct connection between the events that have been noticed at the school in recent weeks.