Nato troops in Bosnia today made early morning raids on the homes of the daughter and the son of Radovan Karadzic.
A spokesman said Nato believed Sonja and Sasa Karadzic are associated with the network supporting Radovan, who is the UN tribunal's most wanted war crimes suspect at large.
At around 3.00am troops broke the doors on two residential buildings in Pale, 9 miles east of Sarajevo, where daughter Sonja and son Sasa live with their families.
Both Sonja and Sasa will be interviewed and their homes searched for any evidence or any information about the support to Radovan Karadzic or his whereabouts, Nato said.
Bosnian Serb wartime leader Karadzic and his general Ratko Mladic are sought on genocide charges by the UN tribunal in The Hague for their alleged role in atrocities committed by Serb troops during Bosnia's 1992-95 war.
At large for over 11 years, Mladic is believed to be hiding in Serbia, while Karadzic's location is unknown.
The US government is offering a reward of up to $5 million for information leading to the transfer to, or conviction by, the International Criminal Tribunal of Karadzic, Mladic or four other suspects still sought by the tribunal.
AP