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.”
More top news
An elderly woman in the Scottish Borders has been defrauded of over £40,000 after receiving a call which claimed to be from her bank.
The man, out walking with a partner, landed on to rocks as he fell down the main footpath from Swirls car park to Helvellyn summit.
Emma Jesson brings you Sunday night's forecast