A Dumfries and Galloway Police spokesman said:
“The causes of the fires are being investigated. We are anxious for anyone with information to come forward so that whoever is responsible can be apprehended.”
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The charity has called for more action from the Government as new figures show an increasing level of abuse.
If accepted, the size of the Lake District National Park could be increased by six percent.
The Tour of Britain will revisit the region during the first stage of the tour in September.