I början av juli 2014, under demonstrationer i protest mot Israels Operation Protective Edge på Gazaremsan, vars mål var att stoppa terrororganisationen Hamas, slog van Aartsen fast att "inga gränser överskreds" när ISIS-supportrar stämde upp i det antijudiska stridsropet: "Khaybar Khaybar, ya yahud, Jaish Muhammad, sa yahud" ["Judar, minns Khaybar, Muhammeds armé återvänder"] -- i grunden en uppmaning till folkmord – och "död åt judarna".
In early July 2014, during demonstrations protesting Israel's Operation Protective Edge in the Gaza strip against the Hamas terrorist organization, Van Aartsen stated that "No boundaries were crossed" when ISIS supporters chanted the anti-Jewish battle cry: "Khaybar Khaybar, ya yahud, Jaish Muhammad, sa yahud" ["Jews, remember Khaybar, the army of Muhammad is returning"] -- basically an incitement to genocide -- and "death to the Jews."Gatestone Institute Corpus Gatestone Institute Corpus