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Pictured: An aerial view of fire damage near a skate park at Bourne Valley Nature Reserve.
Police have stepped up patrols of a protected heathland after a series of 'deliberate' fires started by youths threatened nearby properties.
Since April 1 there have been 21 fires at Bourne Valley Nature Reserve in Poole, Dorset.
Recent fires have been creeping closer and closer to properties and playgrounds surrounding the open space.