"It's probably just someone trying to scare them," say several of the students we talk to at school today.
The threat, found scrawled on a school toilet, said "school shooting Wednesday".
During the day, the school has been open as usual - but staff and school health have to a greater extent been out among the students to meet their questions and possible concerns.
"Despite all our value-based work, you can unfortunately never fully protect yourself from this type of event," says the rector.
He talks about the school's work in creating good relationships with and between the students and the importance of strengthening their self-esteem.
He also emphasizes the importance of good cooperation with the guardians.
In the clip, you hear the principal reason more about why this type of event can happen and also hear what the students think.