nairobi militant faction loyal islamic state increase follow northern somalia dozen last year 200 year u.n. report say days group come u.s. air attack first time increase strength spin-off group attract attention security officials fear could offer safe islamic state militants flee military defeat syria iraq islamic state iraq levant isil faction loyal sheikh abdulqader mumin estimate ... 2016 number dozen ... grow significantly strength consist many 200 fighters say report panel u.n. experts obtain reuters even hundred arm fighters could destabilize whole region say regional diplomatic security source air strike recognition u.s. situation term islamic state faction puntland become increasingly critical somalia rive civil war islamist militancy though south north puntland region locate since 1991 clan warlords overthrow dictator turn friday air strike fail kill mumin security source say abdirizak ise hussein director semi-autonomous puntland spy service say strike kill 20 militants include sudanese fighter two arabs almost mumin fighters somali u.n. report say though group believe include sudanese man sanction unite state group also contact yemen unclear sudanese man u.s. sanction one report kill air strike number fighters puntland increase mostly come southern somalia include foreigners come yemen colonel abdirahman saiid military officer puntland tell reuters u.n. report say defectors mumin faction report group receive money order iraq syria one member say see mumin another leader use truecrypt software communicate unite nations could independently verify claim mumin group slow increase activity past year late 2016 occupy port qandala puntland semi-autonomous region month early year carry first attack fighters kill four guard hotel bosasso economic capital puntland february month group behead three men kidnap somalia main islamist insurgent group al shabaab align al qaeda active horn africa country south repeatedly clash islamic state-aligned faction north islamic state 's footprint spread northern somalia u.n