Detectives have released this CCTV image of a masked person wearing a white forensic suit and carrying a petrol can following an arson attack at a house in Chesterfield.
Police and firefighters were called to a house in Parkside View at about 9pm on Wednesday amid reports that a van was ablaze outside and the flames had spread to the garage.
Nobody was injured.
A Derbyshire police spokesman said: “This CCTV image shows a person who was in the area at the time.
“Police would like to speak to them in case they have information which could help the inquiry.”
A 35-year-old man has been arrested on suspicion of arson and remains in custody being questioned.
Anyone with information should call Derbyshire police on 101, quoting incident number 671 of October 28, or Crimestoppers on 0800 555 111.