(JTA) – A rock was hurled into the New Synagogue in the Polish city of Gdansk on Yom Kippur, shattering the glass of one window while worshippers, including children, were inside. No one was hurt. The rock fell “in the atrium where women waiting for neilah – the final prayer of Yom Kippur,” the Jewish Religious Community in Gdansk wrote on its Facebook page. The perpetrator has been identified and the police are said to be dealing with the attack as a matter of the highest urgency, the World Jewish Congress wrote in a statement condemning the attack.

In his statement, Gdansk Mayor Adamowicz said: “I categorically reject the behavior of the perpetrators and count on them being rapidly caught. I apologize to the Jewish community of Gdansk. In the city of Freedom and Solidarity, we respect all religions and do not accept acts of hooliganism.” The northern Polish city’s community said in a statement that the incident recalled the actions of ultra-nationalists in the 1930s, who “would often target synagogues on Yom Kippur.”

In Poland, which is home to some 20,000 Jews, Deputy National Prosecutor Agata Gałuszka-Górska in May said that the number of antisemitic incidents had dropped by 30 percent, to 112 last year from 160 in 2016. In November, 60,000 people attended a nationalist march in Poland that featured antisemitic and anti-Muslim rhetoric. Opposition by Jewish groups to Poland’s passing in January of a law that criminalizes blaming the Polish nation for Nazi crimes has fueled fresh reports of rising antisemitism in Poland.