Firefighters battled a major blaze at a commercial property in Scarborough early Monday, prompting a three-alarm response.

The fire broke out around 1 a.m. near McLevin Avenue and Tapscott Road, close to Sheppard Avenue East. Crews arriving at the scene found heavy flames coming from the building, along with dense smoke.

Because of the fire’s intensity and concerns over the structure’s stability, firefighters withdrew from the building and continued operations from outside.

No injuries were reported.

The cause of the fire remains unknown. Investigators are expected to examine the property once it is deemed safe to enter.