The stickers, which have been put on both old and recent graves, have a QR code that when scanned shows the name of the person buried and the location of their grave in the cemetery.
The stickers were put both on decades-old gravestones and very new graves that so far only have a wooden cross," police spokesperson Christian Drexler said.
More than 1,000 stickers were put on gravestones and wooden crosses at three cemeteries in the southern German city of Munich.
The 5x3.5-centimeter (1.95x1.2-inch) stickers surfaced in recent days at the Waldfriedhof, Sendlinger Friedhof and Friedhof Solln cemeteries.
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