 On the same day, ISIL gunmen killed 4 Yemeni government fighters, and assassinated the judge Mohsen Alwan, who was investigated the USS Cole bombing.Also on the same day, unknown gunmen killed an energy official, and two security officers.On December 23, unknown gunmen, believed to be AQAP assassins killed the popular resistance colonel Jalal al-Awbali in his car in northern Aden.