kabul afghan u.s. military authorities investigate report many 13 civilians kill operation northern region kunduz officials say monday detail remain sketchy three days incident conflict report casualty number friday incident district chahardara outside kunduz local council member say 13 people kill spokesman provincial governor say one however incident underline risk increase civilian casualties recent u.s. decision step air strike special force operations afghanistan break stalemate taliban militants need proper investigation prove allegations launch soon ghulam qader akbari governor chahardara say monday saturday nato-led resolute support mission kabul confirm incident occur kunduz say investigation begin give detail aware allegations regard potential civilian casualties result combine operation northern afghanistan resolute support spokesman capt tom gresback say statement resolute support take allegations civilian casualties responsibility human life seriously assess facts surround incident khosh bawar nasratyar member local provincial council say 13 people kill u.s. airstrikes district nematullah temor spokesman provincial governor say one civilian kill six wound coalition force hit car take people villages ghar qeshlaq qatl-e-am evacuate taliban casualties say report civilian casualties untrue baseless afghan special force say 48 insurgents kill chahardara deny civilian casualties say area evacuate operation graphic picture purport show aftermath incident unconfirmed report many 60 people kill widely share social media highlight risk public opinion could turn decisively government issue recent unite nations civilian casualty figure release last month show air strike drive rise 52 percent first nine months 2017 205 kill 261 injure versus correspond period last year former president hamid karzai clash bitterly unite state civilian casualties power condemn incident comment government president ashraf ghani u.s. investigate report civilian casualties afghanistan