The crime in Srebrenica is the first event after World War Two which the Hague tribunal classified as genocide, Meron said.
We are commemorating this genocide in order to prevent anything like that from happening again, the ICTY president told reporters.
He called for the urgent apprehension of all the architects of this atrocity.
The ICTY Chief Prosecutor, Carla del Ponte, did not arrive in Srebrenica for this year's commemoration explaining her nonattendance with the fact that the main indictees for the Srebrenica mass killings, war-time Bosnian Serb leaders, Radovan Karadzic and Ratko Karadzic, are still at large.
Asked by reporters whether Del Ponte's absence from today's commemoration could be interpreted as her shunning her part of responsibility, Meron said that he could not comment on the fact that Del Ponte had not come.
I am sure that Del Ponte had good reasons why she did not want to come to Potocari today. I personally feel that I, in my capacity as the tribunal's president, must be here with the victims and that's why I have come, Meron said.
A former US diplomat, Richard Holbrooke, who is known as the architect of the Dayton peace accords which stopped the war in Bosnia-Herzegovina, on Monday arrived in Srebrenica although his attendance at the Potocari commemoration was not announced.
At about 11.00 am he arrived at Potocari together with the US Ambassador in charge of war crimes, Piere Richard Prosper.