baghdad least 800 civilians kill strike iraq syria u.s.-led coalition fight islamic state since campaign begin 2014 accord report release coalition thursday estimate monthly report say coalition strike unintentionally kill least 801 civilians august 2014 october 2017 far low figure provide monitor group monitor group airwars say total least 5,961 civilians kill coalition air strike continue hold accountable action may cause unintentional injury death civilians coalition say report since start campaign islamic state militants coalition carry 28,000 strike receive 1,790 report potential civilian casualties report say still assess 695 report civilian casualties strike carry iraq syria coalition battle defeat islamic state militants iraq syria say go great lengths avoid civilian casualties least 800 civilians kill coalition strike iraq syria report