Police say they need more people to come forward with information after four vehicles including an ice cream van were set on fire.
The vehicles were all destroyed in the fires which happened on four separate nights in the past week in Annan.
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Cloudy with outbreaks of rain, heaviest in west
Emma Jesson brings you Sunday night's forecast
The Met Office have issued a yellow "Be Aware" warning of heavy rain for the region which is valid from 3pm Sunday until 3pm Monday