According to the Southwestern New Hampshire District Fire Mutual Aid, this is a mass casualty incident. Mass casualty incidents are typically declared due to a large number of patients needing medical treatment.
On their official twitter account, dispatchers are calling it an air quality problem in the building.
Ambulances from Jaffrey, Rindge, Fitswilliam, Peterborough and Winchedon, Mass., have all been dispatched to the scene.
We have a crew on the way and will bring you more information as it becomes available.