The garage at the Sheffield house where 34-year-old Craig Kinsella was kept as a slave was set on fire last night.
South Yorkshire Fire and Rescue Service say they attended the blaze after a call at 10.15pm last night.
The garage - which is detached from the main house - was well alight when they arrived. It took just under two hours to bring the fire under control and cool cylinders which were lying nearby. There was no damage to the main house or any adjoining property.