The War Crimes Tribunal in the Hague has released testimony from former NATO commander Wesley Clark in which he claims Slobodan Milosevic knew about plans to massacre Muslims at Srebrenica during the Bosnian War. Clark was giving evidence against the ousted Yugoslav President who is accused of genocide and crimes against humanity. "I said, 'Mr President, you say you have so much influence over the Bosnian Serbs, but how is it then, if you have such influence, that you allowed General (Ratko) Mladic to kill all those people in Srebrenica?" Clark said. "And Milosevic looked at me and paused for a moment. He then said, 'Well, General Clark, I warned Mladic not to do this, but he didn't listen to me.'" Clark gave his evidence earlier this week - behind closed doors, as requested by the US. Prosecutors have said Clark's statements are crucial to their case. **PHOTO CAPTION*** Former Yugoslav president Slobodan Milosevic (L) and former NATO commander Wesley Clark. (AFP/POOL/File)