A massive, 5-alarm fire broke out Friday at an abandoned mill building in Sanford, Maine.
Crews from around 20 communities, including more than 100 firefighters, responded to the blaze, which was reported shortly before 7 p.m., according to affiliate WCSH.
Fire officials said the Stenton Trust Mill building at 13 River St. was considered very dangerous and has previously caught fire.
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According to WCSH-TV, fire officials were worried that the building might collapse prompting warnings to keep firefighters a safe distance away.
"A lot of the fire is contained to the original building," Sanford Fire Chief Stephen Cutter said. "We've backed all units away from the building. It looks like one of the walls is bowing, so we've created a collapse zone around it."
No firefighters have gone inside, and no injuries have been reported.
Crews from Alfred, Lebanon, Ross Corner, North Berwick, Kennebunk and Acton are among those who responded.
Sanford Police are asking people to avoid the area while crews continued to battle the blaze into the morning hours.
The cause of the fire remains under investigation. Fire officials were asking anyone with information relating to the incident to call their tip line at 207-324-3644, x 170.