(JTA) — A group of 10 teenagers in Paris assaulted ten Jewish school pupils at a public sports center.

According to France’s Bureau for Vigilance against Anti-Semitism, several teenagers “of African and North African origins” on Thursday attacked the group of Jewish 13-year-olds from the Ner HaThorah private Jewish school. There were no serious injuries.

The attackers asked the Jews to stop “occupying the area,” the report said, called them “dirty Jews; said “Hitler didn’t finish the job” and shouted “Viva Palestine.”

When police arrived, the attackers fled, according to a report by the Bureau published Friday on the French Jewish news site JSSnews.

Parents and pupils said the attack, in the 19th Arrondissement, turned into a fight as the Jewish pupils tried to defend themselves.

According to the bureau, the attackers may have been pupils from the Edouard Pailleron High school. The Jewish pupils were using that high school’s sports facilities, which are open to use by Ner HaThorah pupils, according to the report.

The Bureau for Vigilance against Anti-Semitism called on French police to prosecute the attackers with help from the management of Edouard Pailleron High School.