In fairness, this was a rapidly issued apology (near-apology?) by U.S. Forces-Afghanistan. Here’s the statement in full, which I received 20 minutes ago:

Coalition Forces offer condolences following non-combatant deaths in Khost

KABUL, Afghanistan – Further inquiries into the Coalition and ANSF operation in Khost earlier today suggest that the people killed and wounded were not enemy combatants as previously reported.