Rain has washed away any chance of using fingerprints to catch the people who vandalised 76 graves at Rookwood Cemetery on Tuesday night.

Police say they have no forensic evidence and are relying on a tip-off to solve the crime after CCTV footage failed to reveal any clues.

Ruined tombstones at Rookwood Cemetery. Credit:Nick Moir

Meanwhile, cemetery management has strengthened security at night to prevent another attack like the one that occurred between 9pm on Tuesday and 6am on Wednesday.

Auburn police crime manager Paul Arnold said police suspected multiple offenders were behind the "senseless act of vandalism" in which headstones were pulled over and smashed.