A suicide attacker in a car detonated a bomb near a US military convoy in eastern Afghanistan on Wednesday, killing a boy who was playing nearby and wounding three other children, a provincial governor said. Two American soldiers were slightly wounded in the attack, said Khost provincial Gov. Merajuddin Patan. The bomber also died. Patan said the wounded children were in stable condition. There was no immediate confirmation from the US military of the bombing, which came amid an upsurge in militant attacks in southern and eastern Afghanistan.