SANFORD — A fire that broke out at a Sanford concrete plant this afternoon has been brought under control by firefighters.

Capt. Paul Morrison said one Sanford firefighter had to be treated for heat exhaustion at Goodall Hospital after battling the fire at Genest Concrete, 36 Wilson St.

Morrison said the fire broke out inside a processing plant where sand and gravel is mixed to make concrete. The cause of the fire, which is not suspicious, remains under investigation.

It took more than 30 Sanford firefighters about three hours to bring the fire under control, Morrison said. The fire was reported at 4:45 p.m.