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Thibault Camus, Associated Press
Riot police shield themselves from rioters, following a pro-Palestinian demonstration, in Sarcelles, north of Paris, Sunday, July 20, 2014. French youth defying a ban on a protest against Israel’s Gaza offensive went on a rampage in a Paris suburb, setting fire to cars and garbage cans after a peaceful demonstration.

SARCELLES, France — Pro-Palestinian French youth defying a ban on a protest against Israel's Gaza offensive clashed with police Sunday, setting fire to cars, pillaging stores and throwing stones in a Paris suburb.

Police, backed by a helicopter overhead, responded with tear gas and shots from non-lethal guns during hours of unrest in the northern suburb of Sarcelles, home to a large Jewish community.

The unrest was the second time in two days that pro-Palestinian demonstrations in France turned violent. The demonstration, like the one in Paris on Saturday, had been banned to ensure peace.

France has Western Europe's largest Muslim and Jewish populations, and crises in the Middle East, like the one triggered by the Gaza offensive, often spill into France.

The clashes came hours after France honored some 13,000 Jews rounded up 72 years ago, most kept in a cycling stadium before being sent to Auschwitz.

In Paris on Saturday, pro-Palestinian youth burned cars and broke shop windows in a neighborhood dominated by immigrants.

Prime Minister Manuel Valls denounced a "new form of anti-Semitism" on the Internet that he said was spreading among youth in working-class neighborhoods.

"France will not allow provocations to feed ... conflicts between communities," Valls said in a speech.

That message was echoed by President Francois Hollande as he decorated Serge and Beate Klarsfeld, who were famous for tracking down old Nazis, as Grand Officer and Commander of the Legion of Honor respectively.

France "will tolerate no act, no words that could give rise to anti-Semitism," Hollande said.

In Sarcelles, several hundred young protesters broke away from a calm pro-Palestinian gathering to riot and clash with police. Scores of Jewish youth — some armed with iron bars — then encircled a synagogue to "protect" it, watched by a cordon of police.

Authorities banned protest marches after a riot in Paris a week ago saw pro-Palestinian youth attacking two synagogues and Jewish stores.

Ganley reported from Paris. Thibault Camus in Sarcelles contributed to this report.