San Antonio fire crews battled what they called a "stubborn" fire at South Side tire and muffler shop early Wednesday morning. 

The flames broke out around 1:30 a.m. at C D Division Tire-Muffler shop which is located just west of Interstate 35 on Division Avenue.

Flames spread through the attic as crews worked for nearly an hour to put out the fire.

Fire officials said fires at tire shops can be more difficult for crews due to concerns over chemicals.

Firefighters weren't able to determine where or how the fire started, so they called arson investigators to the scene.

Damages were estimated at $50,000. No injuries were reported.

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