Arsonists have destroyed a shed behind a derelict house.
Firefighters from Doncaster attended the incident in Clarence Avenue, Balby at 9.15pm last night.
The cause of the blaze was logged as deliberate.
In a separate incident arsonists set fire to a pile of tyres near a caravan site off Lands End Road in Thorne at 10.30pm last night.
Firefighters from Thorne attended and were on the scene about 45 minutes.