It is very important to hear all the accounts to ascertain the most plausible account of events, esp when we, as the public, are in the dark.
Here are some of the accounts:
Pakistan's version -
1. Maps were provided to the ISAF, so they must have known it was a military outpost.
2. The attack was unprovoked, and lasted for 2 hours.
3. The military men were killed in sleep (most of them at least).
4. PA HQ was alerted through the quarters in Peshawar, and they pleaded with the NATO commanders to stop the attack, but to no avail.
Now the statement of ISAF -
1. The incident is highly regrettable, NATO sends out is condolences to the bereaved families of the martyred soldiers.
2. Nothing can be officially said about the incident till the investigation report is out.
Now the account of injured soldiers who experienced the incident firsthand -
1. At about 11pm (3 hours prior to the attack), a light aircraft came from across the border, flies over the post and fires flares and returns.
Cross checking with Pakistan's official version - How is it that such an incident of aircraft coming in from across border and firing flares takes place, and all the troops are still asleep?
2. About half an hour later (not even midnight yet, and still full 2 and a half hours prior to the time of the attack) armed helicopters and light aircraft came. They again fired flares and began firing at the men.
Cross checking with Pakistan's official version - Firing begins at 11:30 PM, and soldiers are still asleep?
3. They remained in the area for about 5 to 6 hours. During this time, the helicopter kept firing at individual personnel at will.
Cross checking with Pakistan's official version - How is it, that the attack lasted 5-6 hours, the PA high command pleads with the NATO forces to stop the attack (throughout 5-6 hours, but to no avail - even if we say they pleaded with NATO forces at 2:30 PM, still they had enough time to send in reinforcements.), and yet does not send in any reinforcements or fighter jets, that shouldn't take more than 30 mins to reach the point of contention?
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What I do (personally) gather from all the accounts and official statements here is that that was a terrible communication gap between the outpost, and the Army headquarters, with the involvement of a communication node at Peshawar. Most probably, it was a case of mistaken identity, the NATO forces acting in an overzealous manner, and the actually bombarding of the outpost lasting no more than a few minutes - provided the Pakistani Army communicated its pleas to stop the attack right away.
Anyhow, the accounts of all the parties involved are still very questionable and leave out many holes yet to be filled to appear as clean as truth. However, I would, for one, believe the accounts of the injured soldier more than the statements of NATO or PA spokesmen.