The first was at 3.10am on Prospect Place in Hyde Park. Firefighters from Doncaster station attended the incident and they left the scene at 3.50am.
A fire crew from Doncaster station were also called out to a deliberate car fire at 3.35am on St James Street in Balby Bridge. They firefighters were there until 4.10am.
A skip was deliberately set on fire at 5.50am on Hartington Close in Holmes, Rotherham.