( CNN ) -- A Jewish human rights organization on Monday called for Thailand 's Christian leaders to condemn a parade at the Sacred Heart School in Chiang Mai , Thailand , in which participating students wearing Nazi uniforms performed `` Sieg Heil '' salutes . The Simon Wiesenthal Center , a Jewish human rights organization based in Los Angeles , denounced the event , saying it was `` glorifying Nazis . '' Photographs of the parade show participants carrying a Swastika flag , performing Nazi salutes and wearing SS uniforms , while others dressed as Adolf Hitler complete with toothbrush moustache . Rabbi Abraham Cooper , associate dean of the Simon Wiesenthal Center , said the images made it clear that the event could not have taken place without the knowledge and cooperation of the school administration . `` It is difficult to calculate the hurt such a display inflicted on survivors of the Nazi Holocaust and the families of all victims of Nazism . There can be no justification for such an outrage to emanate from place of learning , '' he said . The Simon Wiesenthal Center urged those responsible for the school to take immediate action against the individuals who promoted and facilitated the event . Cooper said that a similar parade took place in 2007 at a school in Bangkok in which 200 students participated , and that more recently , members of Thai rock band Slur donned Nazi uniforms in a music video . On Wednesday , the school 's website posted a letter by its director expressing an apology . `` We , the entire Sacred Heart School [ personnel ] are deeply saddened by this incident . '' The letter explained that the sports day activity involved groups being differentiated by colors -- the `` Red '' group having used Nazi symbols . CNN 's Kocha Olarn contributed to this report .
Jewish human rights organization condemns school 's Nazi-themed parade . Images show participating students wearing Nazi uniforms , giving Nazi salute . Simon Wiesenthal Center called for Thai Christian leaders to condemn the event . On school 's website , its director expressed sincere and deep regret over the incident .