International justice systems must be retained for effective prosecution of perpetrators of serious crimes, an official of the UN International Criminal Tribunal for Rwanda (ICTR) said last Thursday. ICTR Prosecutor Hassan Jallow said international courts such as the ICTR, the International Criminal Tribunal for former Yugoslavia (ICTY) and the Special Court for Sierra Leone have proven viable in ensuring the prosecution of people bearing the greatest responsibility for crimes. He was speaking at the beginning of a three-day colloquium of prosecutors in Arusha, Tanzania, which is also the headquarters of the Rwanda tribunal.