Sixth-grade schoolchildren committed serious violence at Kytöpuisto School in Vantaa last Tuesday.
One student was injured and an ambulance was called to the school.
The assault was done at break.
A criminal report has been filed and the police are investigating the case.
Kytöpuisto School, on the other hand, has begun preparations for disciplinary action.
According to the City of Vantaa, the matter will be continued with the relevant guardians and the school staff will be available to all students and families.