(MSC News)--“Non-specific” and likely “non-credible.” 

That's how investigators are labeling a letter mailed to the Buchanan County, Missouri Courthouse by an inmate at the Cameron correctional facility. 

KQ2-TV is reporting the letter is written as a threat to children in northwest Missouri. 

The investigation was launched Wednesday. 

The TV station reports the writer threatens harm to children in Dekalb County, and surrounding areas, if actions aren't taken to meet unspecified demands at the prison. 

Due to the scope of the threat, the Missouri State Highway Patrol is assisting the Buchanan County Sheriff's Office with the investigation. 

Schools in the threatened area have been alerted out of caution as investigators work to determine if there's any validity to the threat.