Helena, state and federal authorities descended on Rossiter School early Tuesday morning when an improvised explosive device was found on the school’s playground.
The man responsible for the Las Vegas massacre last Sunday, Stephen Paddock, used an add-on device called a 'bump-stock' to enable the weapons he fired to mimic a fully automatic machine gun.
The Bureau of Alcohol, Tobacco and Firearms, along with the Ravalli County Sheriff's Office are investigating the theft of explosives from a Victor construction company.