The mob howled for vengeance, the missiles raining down on the synagogue walls as the worshippers huddled inside. It was a scene from Europe in the 1930s – except this was eastern Paris on the evening of July 13th, 2014.

Thousands had gathered to demonstrate against the Israeli bombardment of Gaza. But the protest soon turned violent – and against Jews in general. One of those trapped told Israeli television that the streets outside were "like an intifada", the Palestinian uprising against Israeli occupation.

Two weeks later, 400 protesters attacked a synagogue and Jewish-owned businesses in Sarcelles, in the north of Paris, shouting "Death to the Jews". Posters had even advertised the raid in advance, like the pogroms of Tsarist Russia.

And this....sound familiar?

Social media provides an easy platform for the spread of hate, which has been given impetus by the alliance between Islamists and the left, says Ben Cohen, author of Some of My Best Friends: A Journey Through Twenty-First Century Anti-Semitism. "Saying that Jews are the only nation who don't have the right to self-determination, smearing Israel as a modern incarnation of Nazi Germany or apartheid South Africa, asserting that the 'Israel Lobby' manipulates American foreign policy from the shadows is unmistakably anti-Semitism."

Newsweek: Exodus: Why Europe's Jews Are Fleeing Once Again