At its height, more than 15 fire appliances were on the scene last week.
A fire that destroyed over 40 businesses on an industrial estate started accidentally in a water boiler, a fire service has said.
More than 15 crews attended the blaze off London Road in Baldock on Tuesday, July 11 at about 18: 15 BST.
The Hertfordshire Fire Service declared the incident a major incident and remained on the scene for much of the following day.
The fire started in the flue of a wood-burning water boiler in one of the business units.
A spokesman said the blaze spread to the roof and then throughout the rest of the building - affecting a large number of business units, including collapsed roofs and mangled wreckage.
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