The emergency services and police are on the scene. Christina Hallin, the police spokesperson, says that a similar incident happened yesterday when someone or someone set fire to a trash can - even then.

- The school staff must talk to the students about how serious this is. Fire in a local area is very dangerous and there is a great risk that people may be injured, she says.

It is not yet known who or what is owed to what happened neither yesterday nor today.

"Can be someone outside"

- It doesn't have to be a student but it can also be an outsider because it is an open school. Regardless, it is important that information comes out that this is dangerous, says Christina Hallin.

A meeting with police, staff and students is planned.

Around 700 students attend the school, which has students from preschool class to grade 9.