Firefighters from St Neots were called to a caravan fire in the early hours of this morning (Friday).
Two crews were called to Cambridge Road to reports of the mobile home that was ablaze.
Two firefighters wearing breathing apparatuses used a hose reel to extinguish the fire.
The crews had returned to their station by 1.25am.
An investigation carried out by the fire service found that the blaze was started deliberately.
Anyone with information should contact police on 101 or Crimestoppers anonymously on 0800 555111.
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