A top Bosnian Serb war crimes suspect, indicted by a U.N. tribunal for some of the worst atrocities in the Bosnian war, was arrested Monday in Argentina. Milan Lukic was being held at a police station in Buenos Aires and was to be questioned by a judge after being arrested in the city on an "international request," according to Argentine Federal Police. Lukic was indicted by the tribunal in The Hague, Netherlands, in 2000 for crimes against humanity. He also has been sentenced to 20 years in prison in Serbia for war crimes but has been on the run since late 1990s.