The two boys were arrested on Friday afternoon and, like the previously arrested 17-year-old, are likely to be suspected of attempted murder in the 18-year-old. He was found with cutting injuries outside the school and had to seek out hospital care, but must have been slightly injured.

Report of abuse from Monday

All of those involved in the incident outside the Oscars gymnasium on Thursday appear in another police report regarding an abuse outside the school that should have happened on Monday.

"There is a report on Monday as an abuse between the people involved, what we are going to do now is to put the puzzle pieces about what caused this," said Robert Loeffel, a police spokesman.

Goes to school

Prosecutor Magnus Argus has previously told SVT that the injured 18-year-old and the arrested 17-year-old are both students at the school. Whether the other two arrested boys also go there is unclear.

The police went out early with the plea to get testimony from the scene.

- We do not rule out that more people can be involved, says Robert Loeffel.