Barcelona's chief rabbi said it did not appear the attack had targeted Jews, but security forces instructed him to temporarily close Jewish institutions in the city.
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The "alt-right" leader also complained that Jews are "vastly overrepresented" on the left and in the Ivy League.
After decades of stagnation, the communities are betting big on the herb.
Roger Deneys later apologized for writing on Facebook that haredi Jews "prevent peace in Palestine.”
An adviser to his father on social media, the 26-year-old is no stranger to controversy.