Thorne firefighters were called out to an incident at 11.48pm last night.
Involved was a recycling box which was on fire at Foxhill Road in Thorne.
Officers were in attendance for about ten minutes and it is believed the fire was started deliberately.
At 5.22am this morning Doncaster firefighters attended a rubbish fire at Childers Street in Hyde Park.
This is also believed to have been started deliberately.