Karzai said that only regret is not sufficient and also mentioned that civilian casualties during military operations by coalition forces is the main reason for tension in relations between Afghanistan and United States," the statement said. "It is not acceptable for the Afghan people anymore. Regrets and condemnations of the incident cannot heal the wounds of the people."
The killing of the nine boys took place on March 1 in the Pech valley area of Kunar province in eastern Afghanistan.
Lt. Gen. David Rodriguez, who directs day-to-day operations of coalition forces across Afghanistan, later issued a video statement of apology.
In the video, Rodriguez said troops at a base in the valley were responding to a rocket attack and dispatched attack helicopters to the location they were told the rockets came from. He said the helicopters thought they were engaging insurgents, but it later turned out they were boys from a nearby village who were cutting firewood.