Senior Aide to Karadzic Arrested By RADUL RADOVANOVIC, Associated Press Writer PALE, Bosnia-Herzegovina (AP) - NATO today detained the highest-ranking suspect to be arrested for alleged war crimes in the former Yugoslavia - an aide to former Bosnian Serb leader Radovan Karadzic. Witnesses to the arrest of Momcilo Krajisnik (MAWM-chill-aw KRAH-yee-shnik) said NATO troops with the Bosnian peacekeeping force detained the Serb leader after forcing open a door to his home in Pale, southeast of Sarajevo, with explosives. The French Defense Ministry in Paris said French troops made the arrest. Robertson said Krajisnik was ``the highest ranking person'' captured so far by international forces seeking suspected war criminals in the former Yugoslavia. ``It is good news for justice and good news for the people of Bosnia and Herzegovina,'' Robertson said. ``To those individuals who remain at large I will repeat ... the net is closing.'' Still at large are Karadzic, the No. 1 war crimes suspect in Bosnia, and his top general, Ratko Mladic. Krajisnik, Karadzic's senior aide for most of the Bosnian war, replaced him as the leader of Bosnia's Serbs after Karadzic was forced to give up public functions because of his indictment by the war crimes tribunal. In The Hague, chief prosecutor Carla Del Ponte also urged the arrest of Karadzic, ``who should stand trial jointly with the accused, Momcilo Krajisnik.'' Tribunal spokesman Paul Risley said Krajisnik was one of ``the individuals who ran illegal operations that resulted in the deaths of thousands of Bosnians.'' ``He was present at every meeting where political and military actions were decided upon that resulted in deportations, illegal arrests, ethnic cleansing and the deaths of thousands of Bosnians,'' Risley said.