Afghan president Hamid Karzai has demanded an explanation from the US after an American soldier shot dead at least 16 civilians, including nine children, in a killing spree Karzai slammed as an "assassination" that "cannot be forgiven". The victims, killed when the shooter entered their homes in two villages in southern Kandahar during the night, included at least three women, elderly men, and a child aged just two. On Sunday the mother of the two-year-old also spoke out. Gul Bashra told the Associated Press: "They (Americans) killed a child, who was two-years-old. Was this child a Taliban (member)? "Believe me,...