Singer and dancer Montana Tucker was spurred into action after telling her followers about her grandparents who survived the Holocaust and being shocked at the anti-Semitic reaction.
A fourth person has been detained by police in connection with an anti-Semitic march in the city of Kalisz held last month.
The Regional Prosecutor's Office in the central Polish city of Kalisz has applied to the local court for the temporary arrest of three men charged with inciting hatred for organising an anti-Semitic march in the city.
Andrzej Duda, the Polish president, has condemned an anti-Semitic demonstration in the central Polish town of Kalisz during which a copy of a 13th-Century edict conferring rights and privileges on the city's Jewish population was burnt.
Israeli Foreign Minister Yair Lapid has denounced anti-semitic graffiti recently discovered at the Auschwitz-Birkenau Memorial and Museum.
Spray-painted anti-Semitic texts were discovered on nine barrack buildings at the former German Auschwitz II-Birkenau camp, the Auschwitz Museum announced on Tuesday.
The British ambassador to Warsaw has been summoned to the Polish Foreign Ministry for a meeting after a Polish right-wing journalist and writer was banned from entering the United Kingdom.
The background to the new Code of Administrative Procedure approved by the Sejm is not anti-Semitic, Ofer Aderet wrote in his article published on Wednesday by the Israeli daily Haaretz.
Among the Poles there were the greatest number of those who really helped Jews during the Holocaust, President Andrej Duda said.
Author Steven E. Zipperstein says that the document which begins ‘In the darkest and most tragic hours of history and life…’ was discovered after 82 years but “there is no evidence that Chamberlain or anyone in his office discussed it or, indeed, ever even saw it.”