SCARBOROUGH — A three-alarm blaze has caused extensive damage to a commercial building in Scarborough that houses more than a dozen businesses.

Three firefighters were treated for heat exhaustion while battling the blaze at Scarborough Commons, which was reported at about 7:30 p.m. Monday.

The blaze in the building on U.S. Route 1 was under control by about 9:30 p.m., but the cause remains under investigation.

Crews from several surrounding communities help fight the fire, which forced the shutdown of a stretch of the highway.

The building housed several businesses, including law and medical offices, a yoga studio, and a hair salon.

There were reports that people were still working in the building when the fire broke out, but there were no reports of tenant injuries.

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