The conference, organised by the Croatian Chief Public Prosecutor's Office under the title "Cooperation among state prosecutors in war crimes prosecution - Existing and future forms of cooperation," will focus on issues relating to criminal prosecution of perpetrators of war crimes by national courts.
A joint statement is expected after the meeting, which will be held behind closed doors.
According to Croatian Chief Public Prosecutor Mladen Bajic, the meeting will also be attended by Bosnian Chief Prosecutor Marinko Jurcevic, Serbian War Crimes Prosecutor Vladimir Vukcevic and Montenegrin Chief Public Prosecutor Vesna Medenica.
Kavran said Del Ponte was not planning to visit Zagreb because she would meet top Croatian officials in Brijuni.