It was at 8.20 on Tuesday morning that the police were alerted to a school in Tranås.
According to the alarm, it was a school student who must have been armed with a knife.
A moment later, several police patrols had arrived at the scene and started work after searching for a suspected perpetrator and any injured.
Police later arrested a person and are now investigating attempted murder.
A moment later, the police were able to secure the suspect, who according to the police is a student.
An investigation has now begun with questioning of plaintiffs and witnesses.