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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Gordon James Smith's body was found on 1 July. Police arrested four people, and are questioning three of them as part of a murder inquiry.
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Vikki Gordon's son, Daniel, has Chiari, which affects his brain and spine. He's having surgery today.