A house was destroyed when a spark from an open fire started a blaze which spread through the property.
Firefighters were alerted to the blaze in the semi-detached house on Chapel Road, Pilley, Barnsley, at 9.40pm yesterday and found it engulfed in flames.
Two men who were in the house at the time managed to escape.
One of the men had suffered slight burns and smoke inhalation but did not need hospital treatment.
An investigation into the cause of the blaze established that it started around the open fire in the lounge.
It is believed a spark set fire to the flooring, starting a fire which then engulfed the house.
Firefighters from Tankersley, Barnsley and Cudworth spent two-and-a-half hours tackling the blaze.
That same night firefighters from Sheffield were alerted to a blaze outside a block of maisonettes, which had smoke-logged some homes.
The fire on Beckett Road, Lowedges, was discovered at midnight on Sunday and the occupants of two of the maisonettes had to flee.
There were two women and two children in one of the properties, who were already out when firefighters arrived at the scene.
They were checked by paramedics but did not need to go to hospital.
A sofa and bins were set alight outside the block and the flames spread to a gas pipe.
Police were alerted to the incident.
Firefighters dealt with a number of other arson attacks over the weekend - including a disused garage set alight on Delves Road, Hackenthorpe, Sheffield and a fire in the open off Pitsmoor Road, Pitsmoor, Sheffield.
A car was torched on Broadwater, Bolton-upon-Dearne, pile of rubbish was set alight on Hillside Crescent, Brierley, Barnsley and a motorbike frame was fired on Bay Tree Avenue, Flanderwells, Rotherham.
This morning a car was torched in Main Street, North Anston, Rotherham.
Anyone with information should call police on 101.