Belgrade, Serbia ? Serb nationalists skirmished with riot police in the capital Tuesday, lashing out against the new Western-leaning government that captured war crimes suspect Radovan Karadzic.

Karadzic’s lawyer vowed to appeal Serbia’s plan to extradite the former Bosnian Serb chief to a U.N. war crimes court.

Riot police deployed in downtown Belgrade to keep about 200 members of the extremist Obraz group under control.

Five demonstrators and a policeman were injured, doctors at Belgrade emergency clinic said.

Serb officials say they arrested Karadzic on Monday evening near Belgrade after more than a decade on the run. The war crime suspect had grown a long white beard to conceal his identity and had lived freely in the capital before being arrested.

Karadzic is sought on 11 charges of genocide, war crimes and crimes against humanity for his actions during Bosnia’s 1992-1995 war. The psychiatrist-turned-Serbian-nationalist is accused of masterminding the deadly wartime siege of Sarajevo and the 1995 executions of some 8,000 Muslim boys and men in Srebrenica.

While on the run in Serbia, the world’s top war crimes fugitive worked at a private alternative medicine clinic and wrote for a Belgrade magazine, according to Serbian officials. Karadzic also lectured about meditation at a May festival in Belgrade.

To do all this, Karadzic used an alias, Dragan Dabic, government minister Rasim Ljajic said at a press conference Tuesday. He displayed a recent photo of an unrecognizable Karadzic with long white beard and hair. Ljajic refused to reveal more details about the arrest, saying Karadzic’s movements were being analyzed to help track down another war crimes suspect, Bosnian Serb wartime commander Ratko Mladic.