jalalabad afghanistan islamic state behead 15 fighters due infighting afghanistan eastern province nangarhar officials say separate suicide attack thursday tear crowd provincial capital jalalabad kill least eight two incidents underline insecurity lawlessness across afghanistan thousands civilians kill wound year amid unrelenting violence involve militant group include islamic state taliban bloody day province suicide bomber blow kill least eight people meet supporters police commander sack illegal land grab claim responsibility immediate indication behind attack crowd jalalabad gather demand reinstatement commander survive attack spokesman jalalabad hospital confirm eight people kill 15 wound nangarhar porous border pakistan become stronghold islamic state generally know daesh afghanistan grow become one country dangerous militant group since appear around start 2015. attaullah khogyani provincial governor spokesman say 15 islamic state fighters execute bout infighting group become notorious brutality kill occur surkh ab bazaar achin district detail available confirmation islamic state whose local branch know islamic state khorasan old name area include modern afghanistan taliban islamic state frequently fight nangarhar target sustain u.s. air strike exact nature relationship two group little understand isolate incidents afghanistan fighters appear cooperate afghan intelligence document review reuters year show security officials believe islamic state present nine provinces nangarhar kunar east jawzjan faryab badakhshan north ghor central west islamic state behead 15 fighters afghan official