(ABC News) When the old Sandy Hook Elementary School is demolished, building materials will be pulverized on site and metal will be taken away and melted down in an effort to eliminate nearly every trace of the building where a gunman killed 26 people last December.

Contractors also will be required to sign confidentiality agreements and workers will guard the property’s perimeter to prevent onlookers from taking photographs or videos.

The goal is to prevent exploitation of any remnants of the building, Newtown First Selectman E. Patricia Llodra said Tuesday.

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