The funeral of a former Nazi concentration camp commander was used to celebrate his crimes, a Jewish human rights group said Tuesday and urged Croatia's president to investigate.

Dinko Sakic's funeral was an "outrageous display of unrepentant racism, anti-Semitism and xenophobia," the Simon Wiesenthal Center's Israeli branch director, Efraim Zuroff, said in a letter addressed to President Stipe Mesic and faxed to The Associated Press.

Sakic died at age 87 on July 20 while serving 20 years in prison for war crimes he committed as head of the notorious Jasenovac camp, the worst of about 40 camps run by the then Nazi puppet regime of Croatia.