PALE, Bosnia-Herzegovina - NATO troops in Bosnia raided early Tuesday morning the homes of the daughter and the son of Radovan Karadzic, the UN tribunal's most wanted war crimes suspect at large.

"We are conducting search operations of the homes of Sonja and Sasa Karadzic. We believe that both are associated with the network supporting Radovan Karadzic," NATO spokesman in Bosnia, Derek Chappel said.

Around 3 a.m. 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.

Sonja Karadzic answered a phone call made by the Associated Press as troops were breaking the entrance into the building, where she lives on the second floor with her husband and two children.

"Someone is breaking in. We and the neighbors asked who they are and they said 'police'," she said and hung up abruptly.

Troops similarly entered the building where Sasa Karadzic lives with his family.

"We have been to both of these addresses before and we will come again," said Chappel.

Both Sonja and Sasa Karadzic will be interviewed and their homes searched for any evidence or any information about the support to Radovan Karadzic or his whereabouts, he said.

Bosnian Serb wartime leader Radovan Karadzic and his general, Ratko Mladic, are sought on genocide charges by the UN tribunal in The Hague, Netherlands, 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 whereabouts are unknown.

The U.S. 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.