Surrey Police was called to Spurfield in West Molesey at around 1.25pm on Friday, 6 September following reports of a fire at the location.
Officers are currently in attendance at the scene assisting Surrey Fire and Rescue Service with roads and footpaths in the immediate area closed to members of the public.
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The rally comes after it emerged that the Home Office destroyed thousands of landing cards documenting the arrival of windrush-era migrants