Police say they are treating a fire at a farm near Thakeham as arson after a blaze that destroyed 30 per cent of a property last weekend.
The fire broke out at a derelict farm building, in Storrington Road, on Saturday December 13 with firefighters battling for almost eight hours to put out the flames.
Emergency services were called to the incident at around 12.30am where they found the 70m by 100m farm building ablaze.
The fire raged throughout the early hours of the morning and was eventually extinguished by more than 20 firefighters at around 8am.
A spokesperson for West Sussex Fire and Rescue Service said the fire had been deliberately lit and said no-one had been hurt in the blaze.
A representative for Sussex Police said: “We were advised by Fire and Rescue of a fire at a derelict building on a former mushroom nursery site at Storrington Road, Thakeham, just after midnight on Saturday 13 December.”
Police added the incident is now being treated as arson and is currently under investigation. A spokesman said so far no arrests have been made.
The flames were extinguished by four crews from Worthing, Billingshurst and Storrington.
Relief pumps were also sent to the scene from Horsham, Turners Hill and Littlehampton.
Firefighters used three jets and a water hydrant to put out the flames and a thermal imaging camera was also used to check for hotspots in the property.