A high school principal in Taiwan has resigned after students at his school reportedly dressed up as Nazis for a holiday parade, prompting outrage from local educators and the island’s Israeli representative.

According to the Taipei Times, the school’s principal, Cheng Hsiao-ming, took full responsibility and will step down as the head of Kuang Fu High School in Taiwan’s Hsinchu City.

Photos of students hoisting swastika banners and parading behind a cardboard tank went viral over the weekend. One student was seen emerging from the tank and giving the Nazi salute, a red armband appended to his or her jacket.