Wood Buffalo RCMP are investigating after equipment was damaged at the landfill.
Police say sometime between last Friday night and Saturday morning someone broke into the landfill.
While there, they badly damaged two excavators.
The Mounties are now looking for the suspects.
Anyone one with information is asked to RCMP at (780) 788-4000. You can also contact Crime Stoppers by phone at 1-800-222-8477.