Firefighters dealt with three cars set alight in Sheffield, Doncaster and Barnsley overnight.
A Seat was torched in Bowshaw Avenue, Batemoor, Sheffield; a Volkswagen Golf was set alight in Coronation Street, Thurnscoe, Barnsley and a Volkswagen Polo was fired in Charmers Drive, Clay Lane, Doncaster.
Last night a Honda Civic was set on fire in Kilnhurst Road, Rawmarsh, Rotherham.
On Saturday afternoon a Volkswagen Golf was set alight in Rough Lane, Wortley, Barnsley.
Anyone with information should call South Yorkshire Police on 101.