An unmanned drone carried out the strike , said a Pentagon official . Another U.S. official said the results of the operation are being assessed . Al-Shabaab has said that attack was revenge for the U.S. airstrike that killed Godane . Al - Qaeda is an Islamist militant group , similar to Al Qaeda .
An unmanned drone carried out the strike , said a Pentagon official . Another U.S. official said the results of the operation are being assessed . Al - Qaeda is an Islamist militant group , similar to Al Qaeda .