The report of abuse was received by the police on Friday.
The case will now end up in the youth unit with the police.
- There seem to have been several people involved.
Now we will investigate who did what and if anyone was guilty of any crime, says Johan Thalberg, press spokesperson at the police in Västmanland.
A preliminary investigation leader will now look further into the matter and see what measures are to be taken.
As there were many people at the scene, the police are interested in taking part in information and any films and photos from the incident.