Multiple U.S. breakdowns may have led to the aerial pummeling.
At least three official investigations are underway, including a short-term NATO assessment that could open an early window into what went wrong. But on Wednesday, Doctors Without Borders, the international charity whose medical clinic was hit Saturday, called for an independent investigation, saying the attack was possibly a war crime and that U.S. and Afghan investigators cannot be relied upon to be impartial.
