The Polish police have asked prosecutors to investigate evidence against ultranationalists who had demonstrated on the Holocaust Remembrance Day in Auschwitz.
The police sent them a video of the group (estimated 70-1
The demonstrators were led by Piotr Rybak, who was convicted in 2015 for publicly burning a copy of a Jew.
The Nazis murdered nearly a million Jews and 150,000 non-Jewish Poles in Auschwitz.
Jewish survivors and Polish government officials were involved in Auschwitz on Sunday.
About half of the Jews murdered in the Holocaust were Poles. Also in Auschwitz there were many other victims of National Socialist Germany, including Soviet prisoners of war and gypsies (Roma).
The colossal death toll has been documented by, among others, the Holocaust Memorial Museum of the USA.
The ultranationalist march on Sunday took place away from the main commemoration of the place.
It is reported that this is the first such protest on one of the most solemn days for Jews worldwide.
Rybak, quoted by Reuters news agency, said to his supporters, "The Jewish nation and Israel are doing everything they can to change the history of the Polish nation, and Polish patriots can not allow it."
Police said on Twitter they had analyzed the collected material, including shots and photos of the gathering of Piotr Rybak, and sent the evidence to the prosecutor.
They gave no details about the evidence collected.
Research shows that some Poles participated in the Holocaust, but many other Poles risked their lives to rescue Jews.