Firefighters are treating a blaze in a derelict industrial unit at North Pickenham, near Swaffham, as arson.
Two crews from Watton and Swaffham were called out to the fire at an industrial estate in North Pickenham just before 7.30pm on Wednesday.
They found a small bonfire in a disused unit.
A fire service spokesman said it was thought to have been started deliberately.
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