Firefighters were called out at 10:17 Sunday morning for a fire at St. Marys Carbon Company. When they arrived they discovered flames coming from the roof of the plant on Eberl Street in St Marys. Firefighters were able to contain the blaze to the roof of the plant, but there was water damage to the interior of the building. State police fire marshal Cpl. Greg Agosti determined that the fire was accidental and caused by a malfunctioning furnace stack. Damage is estimated at $50,000.