An employee of the museum at a former Nazi German death camp in Poland has been charged with anti-Semitism along with five other men.
Officers detained the Poles in the eastern city of Lublin on Thursday and charged them with incitement to hatred, after three of them were caught putting up posters at bus stops reading "Zionists Leave Lublin", police said.
They identified one of the men as 50-year-old Krzysztof K - omitting his last name because of privacy laws - who according to local media worked as a graphic designer at the museum at the former Majdanek camp.
He had worked there for more than two decades and had printed some of the anti-Semitic posters on office equipment.
"We're shocked by these revelations," museum spokeswoman Agnieszka Kowalczyk-Nowak said.
"We've launched an internal investigation at the museum. Management has decided to suspend him from duty while the case is being clarified."
Police said the group, which also included a local businessman and several unemployed individuals, had been putting up anti-Semitic posters around town since 2010.
Nazi Germany set up the Majdanek camp on the outskirts of Lublin in 1941 and ran it until 1944.