SAUK CITY, Wis. -

The state fire marshal is investigating after fire damaged a Sauk City hardware store Monday night and Tuesday morning.

Fifteen fire departments were called to help fight the fire at True Value and McFarlane Manufacturing on South Water Street starting at about 11 p.m. Monday.

Firefighters told News 3 they tried to fight the fire inside the building but had to get out after a partial roof collapse. Fire officials were also concerned about the possibility of an explosion because of chemicals on the property.

The fire was declared under control around 4:00 am but crews are still dealing with hot spots, according to a release.

The cause of the fire remains under investigation.

John McFarlane, president of McFarlane Manufacturing Company said he's blown away by the support the business has received from the community.

"We not only plan to rebuild after this unfortunate circumstance, but are doing everything we can to restore immediate service to our customers and provide the services they've come to expect for three generations," he said.

No damage estimate is available yet, but the hardware store and service center is a loss. The manufacturing center was not damaged.