The Pentagon says the US air strike which hit a hospital run by Medecins sans Frontieres and killed 42 people was not a war crime.
General Joseph Votel said that the "tragic strike" was due to human and technical error and confirmed that disciplinary charges are being brought against US personnel.
US forces thought the hospital building had been seized by the Taliban however as the mistaken strike was "unintentional", no war crime had been committed.
"The investigation found that the incident resulted from a combination of human errors, process errors and equipment failures and that none of the personnel knew they were striking a hospital," he said.
He added: "The fact this was unintentional takes it out of the realm of being a deliberate war crime."
MSF said that it was "incomprehensible" that the bombing didn't stop, despite doctors ringing US officials 10 minutes into the raid and pleading for help. The strikes continued for a further 20 minutes.
"Today's briefing amounts to an admission of an uncontrolled military operation in a densely populated urban area, during which US forces failed to follow the basic laws of war," said MSF President Meinie Nicolai.
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