In the summer of 1941, more than 40,000 people -- mostly Serbs -- were killed in the Jadovno concentration camp in Croatia, an ally of Nazi Germany during World War II. The victims were commemorated for the first time on June 25, 2010.
The ceremony in southern Croatia was attended by the Croatian president and the Serbian President Boris Tadic's special envoy Mladjan Djordjevic, according to the All Voices website.
"Serbs, Croats, Jews, and others should commemorate the Jadovno victims and send joint messages of peace and love," Djordjevic said.
The ceremony was attended by numerous government and civil representatives from Croatia, Serbia, and the Republic of Srpska.