In May 1993, during the Yugoslav Wars following the massive war crimes, and acts of "ethnic cleansing" in the former Yugoslavia by Bosnian-Serb forces, the United Nations established the International Criminal Tribunal for the Former Yugoslavia, to try war criminals of all nationalities. The crimes indicted included grave breaches of the Geneva Conventions, war crimes, crimes against humanity, and genocide; it was the first tribunal in which sexual assault was prosecuted as a war crime. The ICTY was the first international war crimes tribunal since the Nuremberg Trials.