St. Thomas firefighters were called out to a fire early Wednesday morning on Sunset Drive, just west of the Wellington Road roundabout.
They responded just after 2:30 a.m. to a vacant house at 9262 Sunset Drive.
Fire crews cleared the scene around 5:30 a.m. however city police remained on the scene as the blaze is being treated as suspicious.
A barn further back on the property was not damaged.
