NATO said that it suspects Milje Kljestan is part of "Ratko Mladic's support network."
Mladic and Radovan Karadzic, the Bosnian Serbs' political leader during Bosnia's 1992-1995 war, have evaded justice for more than a decade after being indicted by the UN war crimes tribunal for ordering the siege of Sarajevo and the 1995 Srebrenica massacre.
The raid on Kljestan's home in the eastern Bosnian town of Vlasenica came two days after the tribunal's chief prosecutor, Carla Del Ponte, asked NATO and European peacekeepers to provide more help in tracking down the fugitives.
(compiled from agency reports)