Port Lincoln police are looking for any information relating to a vandalism and arson attack at Centenary Oval on Tuesday afternoon.
Police were called to the oval at about 2.40pm after people broke into the two toilets under the grandstand and set fire to the bins inside.
A pitch roller on the oval was also damaged during the incident.
Oval and ground staff were not present at the oval at the time.
Oval staff said an eyewitness had seen two people fleeing the scene.
Port Lincoln Football League football operations manager and Port Lincoln Cricket Association secretary Robyn Rowsell said staff and volunteers were disappointed about the damage as a lot of work went in to make sure the oval was available all year round for sport and events.
Police investigated the scene and are looking into the matter further.
Anyone with information on this incident is urged to call Crime Stoppers on 1800 333 000.
MFS put out toilet block fire
Port Lincoln Metropolitan Fire Service firefighters were able to prevent major damage inside a toilet block outside a local supermarket after a fire was lit inside on Sunday afternoon.
The MFS was called out to the toilet block at about 4.45pm after a roll of toilet paper was lit inside the disabled toilets.
The MFS put out the fire and cleared the toilet block of smoke.
Port Lincoln MFS retained station officer Dave Welsh said it appeared there was also an attempt to burn a baby changing table.