Allauddin Khan/The Associated PressAn Afghan man sits in the back of a bus with the body of a person who was allegedly killed by a U.S. service member in the Panjwai, Kandahar province south of Kabul, Afghanistan, Sunday. Afghan President Hamid Karzai says a U.S. service member has killed more than a dozen people in a shooting including nine children and three women. Karzai called the attack Sunday “an assassination” and demanded an explanation from the United States.