BELGRADE, Serbia-Arrested war crimes fugitive Radovan Karadzic, accused mastermind of Europe's worst massacre since World War II, grew a long, white beard to conceal his identity and even managed to practice alternative medicine while in hiding, officials said Tuesday.

Karadzic, disguised by a mane of white hair and glasses, managed to move freely while living in a new part of Belgrade and working at a private clinic, government official Rasim Ljajic said, displaying a photo of the war crimes suspect.

Karadzic, 63, was arrested Monday night in a Belgrade suburb after a decade on the run, officials said at a news conference Tuesday.

War crimes prosecutor Vladimir Vukcevic said a judge has ordered his transfer to the U.N. war crimes court in The Hague, Netherlands, to face genocide charges.

Karadzic has three days to appeal the ruling. His lawyer Sveta Vujacic said Karadzic will launch the process to fight extradition.

Accused with masterminding the deadly siege of Sarajevo and the 1995 massacre of up to 8,000 Muslims in the Bosnian enclave of Srebrenica, Karadzic had topped the tribunal's most-wanted list for more than a decade.

Karadzic's whereabouts had been a mystery, with his hideouts reportedly including monasteries and mountain caves in remote eastern Bosnia.

Serbian security services found Karadzic while looking for another top war crimes suspect, Gen. Ratko Mladic, Ljajic said.

"He was arrested Monday evening near Belgrade while changing locations," he said.

Ljajic said Karadzic, once known for his distinctively coifed hairdo, was unrecognizable with his long mane, beard and glasses.

"His false identity was very convincing," Vukcevic said. "Even his landlords were unaware of his identity."