A three-alarm fire broke out in Waltham, Massachusetts, on Wednesday, authorities confirm.
The call came in around 5:15 p.m. for the blaze in the vacant commercial building at 240 Moody Street.
The fire department confirms that crews were on their way to another fire when they spotted heavy smoke and flames. Firefighters were able to keep the fire contained to the origin in the rear of the building.
One firefighter suffered a knee injury, but is expected to be fine.
The cause of the fire remains under investigation.