A NATO helicopter attack killed 30 Afghan civilians, along with 69 Taliban fighters, according to an Afghani government official quoted in Al Jazeera.
The New York Times places the number of civilians killed at 27.
Afghan president Hamid Karzai condemned the attack. "The repeated killing of civilians by NATO forces is unjustifiable," he said.
General Stanley McChrystal, commander of the International Security Assistance Force, apologized for the attack and promised to redouble efforts to avoid civilian casualties.
NATO officials have not revealed the nationality of forces involved, according to the New York Times.
