Artificial grass was stolen from Mary Bassett Lower School in Leighton Buzzard over the weekend.
The theft took place sometime between 6pm on Saturday, June 14 (shortly after the school’s fete) and 6am on Monday, June 16.
The culprits got away with 30sq metres of the turf.
Police are investigating and will be looking at CCTV footage from the school and surrounding buildings.
If you can help, call the non-emergency 101 number.