Police are appealing for witnesses after accelerants were poured through the letterbox of a house in Accrington and set on fire.
Firefighters were called to the scene at Wordsworth Road around 4am on Sunday.
The fire caused damage to the inside of the house, but no one was present at the time.
Anyone with information about the arson attack or who saw anything suspicious in the early hours of Sunday is asked to contact Accrington CID on 01254 353741 or Crimestoppers anonymously on 0800 555111.
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