kabul islamic state claim responsibility suicide attack monday compound afghanistan national intelligence agency kabul kill least five people wound two blast come week group claim responsibility attack train facility agency national directorate security kabul end attackers kill cause significant casualties statement issue group amaq news agency islamic state say also behind monday attack kabul security officials say explosion cause suicide bomber approach agency entrance foot blow casualties report civilian passersby najib danish spokesman interior ministry say least five people kill two wound u.s. president donald trump brief attack white house press secretary sarah sanders say islamic state local affiliate first appear eastern afghanistan near border pakistan early 2015 become increasingly active claim several recent suicide attack kabul frequently fight taliban militants heavily target u.s. air strike special force operations main stronghold nangarhar province remain considerable uncertainty group operate exact nature connections islamic state iraq syria islamic state claim blast afghan intelligence agency kabul