German Muslim students refused to participate in Holocaust Remembrance Day this year in Gelsenkirchen.

Instead instructors found the message “F*ck Israel, free Palestine,” written on a chalkboard.

The school also found butyric acid cannisters at the entrance to the school.

The Jerusalem Post reported:

Muslim students with Arab and Turkish origins protested participation in an International Holocaust remembrance event for the liberation of the German extermination camp Auschwitz on January, 27­ while the school management showed understanding for their criticism of Israel.

“Some Muslims students said they would not participate in the action,” said Florian Beer, a teacher at the school in the city of Gelsenkirchen in the German state of North Rhine-Westphalia, reported the paper Der Westen on Thursday.

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The Holocaust Remembrance event is part of a global commemoration action to take selfie photographs with a sign saying “I Remember“ or “We Remember.“ A blackboard at the school was defaced with the sentence: “F*** Israel, free Palestine.” The school was not able to identify the perpetrator or perpetrators.

Dr. Efraim Zuroff, the head of the Jerusalem office of the Simon Wiesenthal Center, told The Jerusalem Post on Friday, “First, Muslims students are greatest in need of Holocaust education, so it would be unfortunate if they were excused from those activities.”