It’s believed the offenders visited the memorial on Seville Road in Seville, east of Melbourne, at some point between 4.30pm on Thursday, September 14, and 10.30am on Friday, September 15.
The memorial includes eight glass panels of about 3.5m in height.
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It’s believed the offenders hit two of the panels, causing damage it’s estimated will cost $50,000 to fix.
Police are eager to speak to any witnesses or anybody with CCTV in the area.