Fire crews and police rushed to the scene of a fire in the early hours of the morning.
They received a call at around 3.45am to a four by four vehicle, a large bale of hay and a camping trailer on fire on Wirksworth Rd, Whatstandwell.
The blaze was brought under control with a hose reel jet.
Police also attended, as this was believed to be a deliberate ignition.
A spokeswoman for Derbyshire Constabulary said: "The fire service contacted us shortly before 5am today to tell us they had been to a trailer fire at Wirksworth Road in Whatstandwell and they believe it to be a case of arson.
"We are investigating and are asking anyone with information to call us on 101 quoting reference 86 on August 21."