The account in question has shared videos and images that glorify school shooters and other mass murderers and can be linked to the boy via a relative's email address, the review conducted together with the Expo Foundation shows.
The boy is suspected of attempted murder and is being taken into care under the Youth Care Act (LVU).
Neither the prosecutor leading the investigation nor the boy's legal counsel have wanted to comment on the information or other circumstances in the case. The girl was attacked and seriously injured in a playground on July 13.
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