Story highlights Initial findings of an investigation into a U.S. airstrike against a hospital in Kunduz, Afghanistan have concluded that the U.S. government was aware the site was a hospital

But that information did not get passed to the correct military personnel, two U.S. officials said

Washington (CNN) The initial findings of an investigation into a U.S. airstrike against a hospital in Kunduz, Afghanistan have concluded that the U.S. government was aware the site was a hospital, two U.S. officials told CNN Friday. But that information did not get passed to the correct military personnel, they said.

The officials declined to be identified because the investigation remains ongoing, and both emphasized the initial information could still change as the investigation proceeds. But Doctors Without Borders (MSF), who ran the hospital, "did everything right in informing us," one of the officials said. The location of the hospital "was in the military database" of restricted sites such as hospitals, mosques and schools that U.S. pilots are not allowed to strike even if insurgents are present.

Military investigators are reviewing all available audio tapes and other technical data that may have passed from a command center to the air crew, and also to a special operations forces unit on the ground that was talking to the plane.

Investigators are also looking at whether the crew may have voiced concern about engaging any target in that area of Kunduz since it did not appear to meet the criteria for U.S. airstrikes. Under the "rules of engagement" strikes are permitted to protect U.S. forces, to hit targets associated with al Qaeda or to prevent mass casualties among Afghan forces.

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