Belgrade: Former Bosnian Serb leader Radovan Karadzic took a false name and changed his looks, allowing him to live unrecognised in the Serbian capital until his arrest, Serbian authorities said Tuesday.

Serbian officials said Karadzic was captured in disguise near Belgrade after 11 years on the run and had been working as a doctor.

Karadzic is held responsible for the siege of Sarajevo and the massacre of 8,000 Muslims in the Bosnian town of Srebrenica in 1995.

Serbian officials said Karadzic was caught while moving from one Belgrade suburb to another. They showed reporters a photograph of an unrecognisable Karadzic, now 63.

The trained psychiatrist worked for a private clinic, posing as a specialist in alternative medicine under the assumed name of Dragan Dabic.

Serbian war crimes prosecutor Vladimir Vukcevic said karadzic's false identity was so convincing that "ge moved freely around town, appeared in public places and worked for a private ambulance company. People didn't recognise him."