Story highlights The October 3 mission had several technical and human errors, the officials said

The aircraft was supposed to be targeting a nearby compound suspected of housing Taliban gunmen, not the hospital

Washington (CNN) A U.S. airstrike that mistakenly killed 22 people at a hospital in Kunduz, Afghanistan last month was, in part, the result of military personnel targeting the hospital compound instead of a suspected nearby site from which Taliban fighters were firing, several administration officials told CNN Tuesday.

The October 3 mission had several technical and human errors, said the officials, who would not elaborate. A U.S. military fact-finding investigation into the incident details the mistakes and reveals that the aircraft was supposed to be targeting a nearby compound suspected of housing Taliban gunmen, not the hospital, they said.

Gen. John Campbell, the top NATO and U.S. commander in Afghanistan, will take the unusual step on Wednesday of releasing a brief summary of the investigation's conclusions. The step is unusual because this type of release of information typically does not happen until the military determines if any military personnel will be disciplined or charged with wrongdoing.

Campbell has consulted his legal staff and is expected to keep the information very brief. But an official familiar with his thinking said that although authorities are still determining any potential disciplinary action, Campbell believes the incident is serious and has garnered so much public attention it warrants this step.

It will now be up to Campbell to decide whether to take further action himself or refer the matter to various military services that oversaw the troops involved. He could also decide to take no action.

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