Investigators with the Bureau of Alcohol Tobacco and Firearms said the Windsor Mill fire was intentionally set.

The mill, which stood as an original staple of the Northern Colorado town, burned to the ground just before 2 a.m. on August 6. Fire officials said it’s the biggest fire the town has ever seen.

On Sunday officials wouldn’t cite what led them to believe the fire is human-caused but said they are offering $10,000 for information that leads to an arrest and conviction.

PREVIOUS: Windsor Mill fire still smoldering 48 hours after fire

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“Well, I was angry that firefighters put their lives on the line for this. It was a very dangerous fire,” said Windsor Severance Fire District Chief Herb Brady.

Brady made it clear that labeling the fire as intentionally set does not mean it is arson, or that the person who set it meant harm, it only means the fire was human-caused.

Trying to determine if there was malice is the next step of the investigation for officials.

“Someone intentionally set this fire and caused millions of dollars in damages as well as harm to the people and town of Windsor,” said ATF special agent Debbie Livingston. “It's a horrid act, but [I have] no idea why somebody would want to do something like this.”

Built in 1890, the mill served as a landmark where farmers in northern Colorado would store their grain and feed, distributing it to Windsor and nearby towns.

The mill was decommissioned in the early 90s but became the site for a new restaurant and brewery valued at $10 million. Crews had been renovating the site for months before the fire broke out.


Editor's Note: An earlier version of this article indicated investigators said the fire was arson; they said they've ruled out an accidental cause and believe the fire to have been intentionally set. However, it has not been elevated to an arson investigation at this time.