Fire-fighters were called to tackle a blaze in a static caravan on Wednesday afternoon.
Crews from Garstang and Lancaster were called to the caravan on Station Lane, Garstang, just after 2pm.
When the crews arrived the fire was well alight and as a result caused considerable damage to the caravan, a spokesman for Lancashire Fire and Rescue Service said.
Fire-fighters spent an hour at the scene of the fire.
The spokesman added: “We believe the from the initial call that it could have been a cooking mishap.
“But the fire investigation will continue.”