WARSAW, Poland (JTA) – More than 20 gravestones were destroyed at the Jewish cemetery in Lodz, Poland.

The damage was discovered on Tuesday; it is believed the vandals entered the cemetery on Monday.

Some of the toppled and broken gravestones were from the 19th century.

“It was not a random act, tombstones are not easy to topple,” said Symcha Keller, the head of the Jewish community in Lodz. “Some of them can’t be repaired.”

Also destroyed was the recently renovated tomb of the Rabbi of Staszow, the grandson of Elimelech of Lizhensk.

Police have launched an investigation.