The alarm was received at 00:45 on Tuesday. No injuries were reported and the emergency services were able to leave the scene quickly.
However, the police remain and are conducting an investigation. The National Bomb Protection Service has been contacted.
They are involved in the investigation, says Daniel Wikdahl.
The gate and adjacent windows were damaged in the explosion. The police are classifying the incident as serious public destruction. No suspect has yet been arrested.
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