SOURCE: BBC (4-2-10)
Peter Egner, 88, is suspected of war crimes against Jews and other citizens during the Nazi occupation of Serbia, court officials said.
Mr Egner is an ethnic German who was born in the former Yugoslavia.
He has denied the accusations and has been opposing US attempts to strip him of his citizenship.
Mr Egner became an American citizen after moving to the US in the 1960s.
During the war, he is accused of serving in an Einsatzgruppe, a Serbian police unit run by the Nazis - though he has said he knows nothing about the unit, the Associated Press news agency reports.
US and Serbian authorities have been co-operating on the case.