Anne Thily , public prosecutor in the eastern city of Liege where Julie and Melissa lived , said this was a major case involving some 50 investigators -- including two from the U.S. Federal Bureau of Investigation .
<response> <person>Anne Thily</person> , public prosecutor in the eastern city of <location>Liege</location> where <person>Julie</person> and <person>Melissa</person> lived , said this was a major case involving some 50 investigators -- including two from the <location>U.S.</location> <organization>Federal Bureau of Investigation</organization> . </response>