It was in the afternoon, at half past 15, that the police were alerted to the scene.

The visitor must have gone to school and then gone to the student and abused him.

"He has beaten the goalkeeper in such a way that pain has arisen," says Ulf Eriksson, station commander of the police in Kungsbacka.

Unknown motif

Staff moved in and separated the two guys. It is unclear why the incident occurred and whether those involved, who are about the same age, know each other even earlier.

There should be no information on whether the injured student needed to seek care. The 17-year-old is suspected of abuse but is not deprived of liberty.