Still, I am not finding the Pakistani army version of the events 100% believable. Since most of the passengers were VIPs, they must have conducted the necessary security checks and maintenance inspections before the takeoff.
BTW, I don't know why so many people are mentioning 9/11 here. There is no connection between the two events. That said, all of the perpetrators in that attack were Muslims, although I am not that sure about the masterminds.
Military spokesman Maj Gen Asim Bajwa that this incident was occurs due to technical fault. He said there is a fault in their engine or due to engine failure..
And yes there is no connection between 9/11 and this event of helicopter's crash in Naltar Pakistan.