Residents of a house fled after a fire started outside their home spread inside early this morning.
The fire in Welland Crescent, Elsecar, Barnsley, was discovered at 5.40am.
Firefighters said rubbish outside the house was set alight and flames spread to the property.
When crews arrived the occupants had already managed to escape.
A police probe is underway.
Witnesses or anyone with information should call South Yorkshire Police on 101.