Police were investigating the appearance of anti-Semitic graffiti on the outside of the B’Nai Shalom Synagogue in Olney, Maryland, NBC Washington reported.

Parents arrived to drop their children off at the synagogue's summer camp on Monday morning and were shocked to discover the anti-semitic words and symbols that had been spray-painted across the building.  These included swastikas and the words "Arbeit Macht Frei" meaning "work will set you free"; the words that were painted above the entrance to Auschwitz concentration camp.

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The synagogue's Rabbi Ari Sunshine told NBC that he did not immediately have the slurs painted over, because he wanted congregation and committee members to see what had happened.

“If we just cover over the words and the symbols and get rid of it in the next hour or two hours, without a chance for people to come together and work at that and symbolically stand together as we remove these words, then a great teaching opportunity will have been lost,” the rabbi reportedly said.

In addition to the synagogue vandalism, two homes in the area were also spray-painted with swastikas and other symbols.

The vandals had not been caught and police were appealing to the public for information.

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