BELGRADE, Serbia -- A Nazi hunter criticized Serbian authorities on Wednesday for failing to seek the extradition of three men with suspected links to atrocities against Jews, Serbs and Gypsies during World War II.

Efraim Zuroff, director of the Los Angeles-based Simon Wiesenthal Center's office in Israel, said Serbian authorities have done little to bring to justice Croats Ivo Rojnica and Milivoj Asner, and Hungarian Sandor Kepiro.

"Sadly, we have heard a lot of nice words, but there was no concrete action" by Serb authorities to start the extradition procedure, Zuroff said after attending a commemoration for some 1,400 victims of the Nazi occupation in 1942 in Novi Sad, northern Serbia.