The Captain of the St. Johnsbury Fire Department said it happened this afternoon on Mount Pleasant Extension.
After investigating, crews said it appears to be an electrical fire.
Thankfully the homeowners were not inside when the fire happened.
The American Red Cross is assisting those families.
We're told the mobile home is a total loss.
Copyright 2015 Nexstar Broadcasting, Inc. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.