Former Bosnian Serb leader Radovan Karadzic has arrived at the U.N. War Crimes Tribunal in The Hague, where he will be tried for genocide.

Karadzic was flown to the Netherlands in the pre-dawn hours Wednesday from Serbia's capital, Belgrade, where he had been held since he was arrested last week after 12 years on the run.

Karadzic was one of the world's most wanted fugitives. The war crimes tribunal has charged him with genocide for his alleged part in the 1995 slaughter of 8,000 Muslim men and boys in the Bosnian city of Srebrenica.

On Tuesday, Serb ultranationalists clashed with police during a rally in Belgrade to protest Karadzic's arrest and upcoming war crimes trial. At least 44 people were injured, including 25 policeman and one journalist.

Witnesses say hundreds of young men broke away from the main rally to throw rocks at police, who responded with tear gas and rubber bullets.

Police say about 15,000 people attended the rally in Belgrade's main square - far fewer than the 100,000 organizers had expected.

Some in the crowd called Karadzic a hero who saved Serbian lives during the Balkan wars of the 1990s.

While on the run, he had assumed a new identity, heavily disguised his appearance, and practiced alternative medicine. He faces a total of 11 charges of genocide and war crimes. Among the charges is his alleged role in the 1995 siege of Sarajevo - a blockade in which snipers, shellfire, disease and starvation killed thousands of people in the Bosnian capital.

Some information for this report was provided by AFP, AP and Reuters.