A preliminary investigation into destruction endangering the public has been opened after the incident, which Nacka Värmdö Posten first reported.
The police declined to comment on whether there are any suspects in the case. No one has been reported injured.
The property owner is one of those who raised the alarm. I can't say whether he was in the property or noticed it in any other way, says Niklas Berglund.
The alarm came shortly after five o'clock on Sunday morning.
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