Several American soldiers were wounded but they did not return fire.
Five soldiers had been wounded and two were dead so far.
No American soldiers have been killed or wounded here in five months.
Four soldiers were wounded in the fight, the army said.
Another soldier had been wounded when he tried to man the position.
A second soldier was wounded in the area, the military added.
At least four other soldiers were wounded in the attacks.
It was not immediately clear whether any American soldiers had been killed or wounded.
Three British soldiers were wounded in the attack, he said.
No American soldiers were wounded, he said, and only one gun was found on the scene.
