The girl, who is under 15 years old, was taken by ambulance to hospital with injuries that, according to Region Kronoberg, are minor.
A boy under the age of 15 who is a pupil at the school is suspected of the crime. He was found by police a short distance from the school and taken to the police station in Växjö for questioning.
Shortly after the girl was injured, a video was posted on social media in which a boy says he has stabbed a person and that he is being chased by police, SVT Nyheter Småland reports SVT Nyheter Småland . The video refers to the online movement True Crime Community (TCC), which attracts people who are interested in - and celebrate - acts of violence.
"We do not want to comment on it, because it is part of the investigation at this time," says police spokesman Robert Loeffel.
The boy has been handed over to social services, the police write on their website.
