Where do these 6 NM come from now? BBC sais 12 SM south, which would place the aircraft not under the SID direction Yaounde but rather under the DME Arc for the arrival. IF the 12 SM and the direction South were correct, I do wonder if they for some reason were on the DME arc used in the arrival procedure when what happened did happen?
Edit, YAHOO (link above) claims 12 Miles southeast, along the flight path...
Also, is it confirmed that the last contact was the hand off call? That one would occurr around FL60, and it should take longer than 12 Miles to get that high?