During Thursday afternoon, threats were directed at staff at the Norrtullskolan in Söderhamn. The threats were directed by upset parents, which led to a swift decision to lock the school and place security guards on Friday.

Carina Engblom is the principal at Norrtullskolan and looks very seriously at the event.

- The threats have come in connection with a dissatisfaction with how the school is acting. But it's uncomfortable, she says.

Hear her tell about the threat image in the video above.