Fire crews were called to a large fire in Borehamwood after aviation fuel and cylinders exploded.
At around 5.30pm April 29 Borehamwood, St Albans and Potters Bar Fire crews were called to the large blaze in Green Street, Borehamwood.
The fire was out by 8.30pm. The land was used for storage and the fire service have said no one was injured.
Borehamwood Fire said an investigation is underway as it appears to have been deliberate.
Police were called to the fire at the farm. The incident is being treated as arson and police are investigating.
Anyone with information is asked to contact police on the non-emergency number 101.
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