Fire heavily damaged a commercial building Tuesday night at Adley’s Auto Sales and Service in Rumford, causing an estimated $1 million damage or more, fire Chief Chris Reed said.

The building on Prospect Street contained tow trucks, an excavator, a Bobcat and many tools that were lost in the fire.

The cause remains under investigation.

Brad Adley, the business owner, told Reed they had thawed out a water pipe in the corner of the building and then cooled it. They then put the wall insulation back. He checked the pipe and didn’t smell anything before he closed the building up for the night, Reed said.

The building, which is away from the main repair service area, caught fire shortly after. When firefighters arrived the building was engulfed in smoke and flames.

Firefighters were able to cut off the garage door and a firefighter entered the building and drove out the door with a new tow truck that was on fire, Reed said, noting that Adley hadn’t even had a chance to make his first payment on the truck.

Firefighters extinguished the fire on the truck. Other tow trucks, an excavator, a Bobcat and many tools were lost in the fire.

Route 2 was shut down on both sides because fire hoses were laid across it while firefighters fought the blaze.

Firefighters kept the fire away from a used oil storage area on the site.

About 50 firefighters from Rumford, Mexico, Dixfield, Peru, Andover, Roxbury and Jay responded. No injuries were reported.

Med-Care Ambulance service and Rumford Police Department along with the Maine Department of Environmental Protection also responded. Rumford Highway Department assisted with the road closure.

The Office of the State Fire Marshal was called in because of the extent of damage and the high dollar amount, he said.

The company has been in business for more than 40 years, according to its website.

Rumford firefighters cleared the scene at 6 a.m. Wednesday. Reed and state fire investigators were to examine the scene Wednesday afternoon to better determine the cause, Reed said.