Gloucestershire police said the fire was extinguished.

But officers will remain at the scene overnight after “major damage” was caused to the building, making it unsafe.

Police, with support from the canine unit and the National Police Air Service, are trying to locate two other men who were seen fleeing the farmland fire.

However, no one has been located yet.

Police said one of the men was wearing a black hoodie and gray jogging pants, while the other man was wearing black shorts and a red hooded top.

They were said to be in their 20s or 30s.

Previously imposed road closures have now been lifted.

Anyone with information about the incident was asked to call the police.