The top American commander in Afghanistan, Gen. John F. Campbell, on Wednesday said that several service members had been suspended from duty after an internal military investigation of the American airstrike on a Doctors Without Borders hospital in Kunduz last month.

General Campbell read a statement announcing the findings of the investigation, which he said concluded that “avoidable human error” was to blame, compounded by technical, mechanical and procedural failures. He said that another contributing factor was that the Special Forces members in Kunduz had been fighting continuously for days and were fatigued.

General Campbell and his staff did not say how many people were being disciplined, or how.

But a senior United States military official, speaking on the condition of anonymity, said that one of those punished was the Army Special Forces commander on the ground in Kunduz during the fighting.

After reading the statement, General Campbell left the briefing room, at his headquarters in Kabul, without taking questions.

Neither the commanding general nor his spokesman made any comment on the repeated assertions of senior Afghan officials that the hospital was being used as a base by the Taliban to attack coalition forces.

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