ORR, MN (KDAL) - The St. Louis County Sheriff's Office is investigating a Thursday morning incident in the rural area just west of the City of Orr.  Officers were called to the scene on a report of a 26 year old female who assaulted two family members with a knife and then started a fire in the basement of the home.  The family extinguished the fire and held the woman until officers arrived.  She was taken into custody and is now in the St. Louis County jail at Hibbing awaiting formal charges.