A Southern California high school that has sought to quell outrage after photographs surfaced of students giving a Nazi salute at a party is reeling again after officials say fliers with Nazi swastikas were found on campus over the weekend.

Late Saturday night or early Sunday morning “Nazi posters” were placed on the campus of the school, Newport Harbor High, a spokeswoman for the school district, Adriana Angulo, said Wednesday. School officials immediately called the Newport Beach police department to report them, Ms. Angulo said. She described the act as “vandalism.”

Officers responded to the school on Sunday morning and discovered about 10 fliers, some with Nazi symbols on them, said Heather Rangel, a spokeswoman for the police department.

“Nobody is claiming responsibility,” Ms. Rangel said Wednesday. There was no photo or video evidence for the police to review, she added. It was not clear whether the appearance of the fliers was connected to the previous episode, she said, which involved students at a party giving a Nazi salute in front of dozens of red cups arranged in the shape of a swastika.