According to the newspaper, the alarm went off at the school on Saturday evening and security guards and police responded.
The school's principal told the newspaper there was extensive damage, with furniture broken and overturned, books scattered, and china and glassware broken.
I was sad, very sad. Why do you do this? the principal told Falu-Kuriren.
Because the school needs to be cleaned and sanitized, officials decided to cancel Monday's classes for approximately 750 students.
Police are investigating suspected vandalism and trespassing, but it is not clear how the suspects managed to gain entry.
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