Arsonist torched an empty house in Agbrigg last night.
Firefighters were called to unoccupied property Grosvenor Street at around 11.30pm, on Sunday.
The fire was believed to have been started in an upstairs bedroom.
A spokesman for West Yorkshire Police said: “Police are working with fire investigators to establish the full circumstances. It is being treated as suspected arson.”
Anyone with information should call police on 101 or Crimestoppers anonymously on 0800 555111.