(CNN) Flyers with Nazi swastikas were posted at a California school just days after a Holocaust survivor shared her firsthand horrors with students who had posted anti-Semitic photographs during a party.

Ten flyers were discovered at Newport Harbor High School on Sunday morning. Police were called and the flyers were removed. While posting the flyers is not a crime, Newport Beach police are investigating.

School principal Sean Boulton said in a statement: "Again we condemn all acts of anti-Semitism and hate in all their forms. We will continue to be vigilant with our stance, and the care of our students and staff."

But one senior at the school, Max Drakeford, called the latest episode "super disheartening -- a step backward."

Drakeford, whose grandmother survived the Holocaust, said the posters "send a message that we aren't welcome at our own school."

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