Jewish human rights group the Simon Wiesenthal Center on Tuesday urged Belgium to respond to the stoning of a Jewish school bus by teens.

In a letter to Belgian Interior Minister JoÃ«lle Milquet, SWC Director for International Relations Dr. Shimon Samuels said the stoning of the bus crossed “a new threshold in the spiraling violence against the Jews of Belgium. From the Brussels Jewish Museum to Flemish Antwerp.”

“Antwerp – a centuries old, orthodox Jewish centre at the heart of the global diamond industry – is now colloquially known as ‘Gaza,'” Samuels wrote. “Talk there is rampant in the Pelikaanstraat gem-stores of an exodus from Belgium.”

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He said SWC viewed “the pogrom of the Antwerp Hayder school bus as the latest example of a perception of impunity”, adding that “the teenage perpetrators must be detained before their possible departure for the killing fields of Syria. Their school must be held responsible and Jewish school buses must be guarded just as the schools themselves.”

“Even the unthinkable scenario of a Judenrein (Jew-free) Antwerp would not stop an eventual Jihadist threat to general Belgian society,” Samuels said.