The October 3 air raid on a Doctors Without Borders (MSF) hospital in the Taliban-held northern city of Kunduz killed at least 30 people, sparked an avalanche of global condemnation and forced the French charity to close the hospital.
Two military officials told the New York Times yesterday that a combination of human and technical errors meant that a Special Operations AC-130 gunship aircraft hit the hospital instead of an Afghan intelligence compound hundreds of feet away that was thought to have been commandeered by Taliban fighters.
The findings will be officially announced by US General John Campbell at NATO headquarters in Kabul at 7.00 pm today (1430 GMT).
The officials' account as quoted by the NYT does not address why the attack - which lasted more than one hour - was not halted despite frantic telephone calls from MSF staff, nor why US ground forces failed to intervene when they saw the wrong building being hit.
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The US military also failed to follow its own rules of engagement for calling air strikes - that American or Afghan troops must be in extreme danger - while the Special Operations Forces did not positively identify that the area targeted was legitimate, the paper said.
"There was certainly some confusion over what they were shooting at," an official told the Wall Street Journal, which received a similar briefing. "If there wasn't, then this wouldn't have happened."
A NATO statement released hours after the attack on Saturday, October 3 would not confirm the hospital was targeted, characterising it instead as "collateral damage" as Afghan forces came under fire.
The next day the US confirmed the hospital was hit directly, but did not offer further details.