Abdalla ibn Alwaan is Omar Ibn Alwaan's son and also Sayif ibn Alwaan's half-brother. He is the one responsible for the attempts of Sayif's life due to the fact that he disliked Sayif's carefree lifestyle and extensive partying. Adballa escaped being prosecuted due to the fact that he had diplomatic immunity although his father assured NCIS that Adballa would be punished.