MURFREESBORO, Tenn. -- Firefighters in Murfreesboro battled a blaze near downtown Saturday afternoon that destroyed a building housing a medical supply office.

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Firefighters responded to the business, Music City Medical Supply, shortly after 10:30 a.m. and found the 100-year-old building in flames with heavy black smoke. Because of the building's age, it didn't have fire walls. A thick level of brick kept the fire from spreading.

"Anytime you have masonry walls like that without any penetration through them, that helps out a lot," said Assistant Chief Ken Honeycutt, who is also the Murfreesboro fire marshal.

The fire caused smoke damage to the neighboring 3 Brothers Deli and Brewhouse. Both of those businesses will be closed indefinitely following the fire.

"It could have very easily destroyed three other businesses here," said Honeycutt.

The medical supply office is closed on weekends. No injuries were reported.

The building, a total loss, was torn down later in the day.

Music City Medical Supply owner Barton Dobson was in Cross Plains, Tenn., at a high school wrestling tournament with his children when he received a call that his business was on fire.

"It's pretty devastating to see," said Dobson.

Dobson is not only the owner of Music City Medical; he also uses the supplies that he sells.

"I'm a quadriplegic," said Dobson. "All four limps are effective with paralysis."

He said his main goal is making sure all of his other clients are taking care of.

Dobson said he's still in business and that supplies are being shipped to customers out of his Smyrna location. Music City Medical Supply will have limited capabilities for the next few days but Dobson hopes to be fully operational by the end of the week.

It could take up to a week before the cause of the fire is known. Fire officials are clearing out piles of charred debris in hopes of finding some clues.

"The goal is to find a cause," said Honeycutt. "We'll get the big heavy equipment like you see over here and dig it out a little bit at a time and go through it."

Reporter Larry Flowers contributed to this story.