A fire broke out overnight at Longmont’s historic sugar mill, a landmark with deep ties to the city’s industrial past — here’s a look inside the iconic structure, originally posted by the Longmont Observer in May 2017.

Crews were not able to fight the fire at the abandoned sugar factory because of hazardous materials inside the building and weather conditions, sheriff’s officials said.

The fire at the 120-year-old sugar factory was likely human-caused, said Rick Tillery, a spokesperson for the Mountain View Fire District.