Firefighters responded to a large building fire in Iredell County early Sunday morning. According to the Cool Springs Volunteer Fire Department, crews responded to a structure fire on Campground Road around 3 a.m. With assistance from Harmony and Center (Davie County) and County Line, firefighters encountered a large working building fire. Firefighters said they worked to establish a water supply and shuttle tankers until the fire was under control around 4:30 a.m. The Iredell County Fire Marshall is currently investigating the fire. No injuries were reported and no further information was released.