I have lived in Islamabad for 25 years. This circling to land on 12 was always very dicey in my view. The procedure is you fly the ILS to 30 then break-off and turn right and then fly the arc downwind to land on 12.
Obviously he drifted beyond the arc. As a previous 747 skipper he should know Islamabad very well.
You are probably wondering why not break off to the left, away from the Margalla hills. Well to the left is a military airbase (Dhamial) and the Headquarters of the Army (GHQ) and that is all restricted airspace.
Pakistan has never published an air accident report in 62 years. I don't think that is going to change in this case. Pity. No lessons will be learnt from the facts of this tragedy and the public will be fed on rumors and speculation until this accident fades from the front pages and is forgotten.
I wonder whether someone here more resourceful than I can get the approach plates for OPRN. I had them but lost them. The plates will have the procedure.