BERLIN — Following an attack on dancers at a Jewish festival, Jewish leaders say they are worried about a possible upsurge in anti-Semitism among Muslim youth.

A group reportedly consisting mostly of children and teens of immigrant backgrounds threw stones at the Chaverim dancers from the Hanover Liberal congregation on June 19 and shouted, “Jews out!” One dancer was slightly injured. The performance was cancelled.

The stone throwers were mostly of Lebanese, Palestinian and Iranian origin, the Welt Online daily reported. Police have identified six suspects in the attack, five Arab immigrants and one German.

The city of Hanover has filed charges of slander and intent to cause grave physical harm. Reportedly it was the first violent anti-Semitic incident this year in the greater Hanover area that was not committed by neo-Nazis.