March 6 - US forces in
The footage shows local people in shock, treating the wounded and pulling bodies from the debris left by the shooting.
After the Nargarhar incident, a separate Nato air raid in northern
Witnesses say the suicide bomber had acted alone, that there were no accomplices and that US troops had panicked, firing at anything that moved immediately after the attack.
One told Al Jazeera: "There were no gunmen, this is a complete lie. This is a peaceful area, we don't have guns."
The dead included an 80-year-old man, whose grandson said: "A bomb exploded, my grandfather sat in a car and at that time American soldiers were shooting into my grandfather's car."
Hamid Karzai, the Afghan president, condemned the killings earlier on Monday and ordered an investigation into Sunday's attack.
His office and the Afghan interior ministry on Monday put the death toll at 10 civilians while the coalition late on Sunday said eight Afghans were killed and 35 wounded.
Responding to Al Jazeera's discovery of the footage, a spokesman for the
"We regret the loss of life of the Afghan civilians, but coalition forces were attacked by both a suicide bomb vehicle and small arms fire.
"Our forces returned fire in self-defence against numerous enemy positions," said Lieutenant Colonel David Accetta, coalition forces spokesman.
"We don't train or order our troops to fire on unarmed civilians, and it's uncertain at this time what caused the casualties.
"But it's important to note that the extremists conducted this attack in an area that they knew would cause civilian casualties," he said. alJazeera