A fire broke out at the former Great Western Sugar Factory in Longmont early Sunday, with flames concentrated around wood materials stored in a machine shed. Firefighters from Mountain View Fire Rescue and Longmont Fire were unable to enter the building due to hazardous conditions and decided to let the fire burn out safely. Residents were advised to keep their windows closed as smoke could be visible in the area. The fire was reported to have reignited Monday morning, prompting continued monitoring from fire crews. Investigators are looking into the cause of the fire, but the building's dangerous state complicates access for thorough examination. The site has a history of fire incidents, including past damage from vandalism and structural instability.