police have released images of an unidentified man they are trying to trace in connection with a sex abuse probe .
the fbi confirmed it found images of a ` pre-pubescent blonde girl ' that appear to show her being sexually abused , which could have been taken ` in america or elsewhere .
' officials said one picture , which does not show any abuse taking place , features the unidentified man posing with her .
they said they are trying to trace the man - referred to as john doe 29 - because they believe that it is still ongoing that