(Greenfield, MA) A fire at the Four Rivers Charter School in Greenfield is under investigation by the Greenfield Fire Department and Massachusetts State Police. The small fire started in a bathroom, setting off the sprinkler system and resulting in water damage throughout the high school building. The middle school building was not effected and those students resume classes tomorrow but the high school building will not be usable for weeks. High school teachers and students are left without a school until a solution is brought forward.