Needles were found over three days last week and it is still unclear how they ended up in the food.
"We understand that this is causing concern among students, staff and guardians. We are now working intensively to find an explanation and keep the students safe during school meals," the principal tells SVT.
The school has filed a police report. It has also been in contact with the supplier and has reported the incidents to the municipality's environmental and health protection department.
