Thames Valley Police is appealing for witnesses to arson in Stoke Poges, Buckinghamshire.
At around 11.55 pm on Friday 3 February, two offenders gained entry to a construction yard on Hollybush Hill via the main road.
They lit three separate fires across the yard, causing severe damage to an outhouse/office, a plant machinery digger, and a Ford Transit van. No one was injured.
One of the offenders is described as a white man, of large build and wearing a black North Face hooded jacket, navy blue Nike joggers, black Nike Air Force trainers, and a black balaclava. Due to the spark from the flames, he may have sustained burns to his hands.
The other offender is described as wearing a black rain jacket, a black hoody, and black trousers.
They are believed to have travelled to the location in a white Peugeot Boxer van.
PC Heather Gray said: “I am appealing for any witnesses or anyone with information about this offence to please come forward.
“Fortunately, nobody was injured by the fire; however, this took place in a residential area so it could have been even worse, although the damage to the yard is significant.
“If you have any CCTV footage in the area or any dash-cam footage if you were in the area around the time, I’d also ask that you check any recordings in case it has captured something that could assist our investigation.
“To contact us, call 101 or make a report on our website, quoting reference number 43230050954.
“Alternatively, you can provide information anonymously to the independent charity, Crimestoppers, by calling 0800 555 111 or via its website.”