PHR investigated mass crimes in Croatia in the early 1990s, providing pivotal scientific documentation for eventual prosecutions. Soon after the Croatian War of Independence, PHR collected evidence of war crimes in the former Yugoslavia under the auspices of the U.N. War Crimes Commission of Experts. In 1993, PHR experts helped discover and later exhumed and investigated a mass grave near Vukovar, concluding that the murdered bodies were those of more than 200 medical staff and patients who had disappeared during the evacuation of Vukovar Hospital by the Yugoslav National Army (JNA) in November 1991. PHR’s findings were submitted to the International Criminal Tribunal for the former Yugoslavia (ICTY) and helped lead to the eventual arrest of Slobodan Milošević, former president of Croatia, on charges of genocide, war crimes, and crimes against humanity.