PBL,
If the crash site is north of the Faisal Mosque (a prominent Islamabad land-mark) which is located at about the foothills of the Margalla, then this accident gets crazier by the day. I don't know how anyone can be so far off.
My late father's house faces the Margalla hills. That is why he bought it because he liked the view. If you are doing the circle-to-land on 12, you are about two/three miles when viewed from the backyard of the house flying parallel to it before turning base.