The growing influx into central Europe of refugees from Muslim-majority countries with a deeply rooted culture of lethal anti-Semitism has started to jolt Jewish leaders and journalists into an examination of dangers inherent in the mass migration.

Oskar Deutsch, head of Austria's Jewish community, issued a warning in a column last week in the daily Kurier, "The hundreds of thousands of refugees from Syria or Afghanistan who are coming to Europe were exposed while growing up to decades of anti-Semitism. Jew-hatred was learned and promoted in schools, newspapers and social networks. Terrorism against Israeli was celebrated – such as Islamic attacks on Jewish schools, synagogues and Jewish museums in the West."

Deutsch further warned of Islamic State fighters disguised as refugees. His concern is grounded in European reality; Islamic State and Jihadi-affiliated combatants have attacked and murdered several European Jews since 2014. For example, the French-Algerian Mehdi Nemmouche, who murdered three people at the Brussels Jewish museum, was a trained Islamic State terrorist.

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