Experts , officials warn of growing threat from Somali militant group . `` The issue is not Somalis taking over from other Somalis . Al-Shabaab is one of strongest Somali militias battling for Nairobi . Nairobi says Al-Shabaab is to region and world despite threats on Kenya .
Experts , officials warn of growing threat from Somali militant group . Al-Shabaab is one of strongest Somali militias battling for Nairobi . Nairobi says Al-Shabaab is to region and world despite threats on Kenya .