Dorset Police was called at around 6am on Sunday 12 August to an address in Hamcroft, Easton.
The fire started in the porch and caused significant damage to the lounge and its contents before being extinguished by the fire service. A woman who was inside the address left without injury.
“If you have any information that could assist with the investigation please contact Dorset Police or call Crimestoppers anonymously.”
Anyone with information is asked to contact Dorset Police at www.dorset.police.uk, via email firstname.lastname@example.org or by calling 101, quoting occurrence number 55180129311. Alternatively, contact Crimestoppers anonymously on 0800 555 111 or via www.crimestoppers-uk.org.