Bin Laden 's deputy at that time , Ayman al-Zawahiri , took a different view . Al-Shabaab chief Zubayr has a reputation for being secretive , merciless . Al-Shabaab wants his group to be able to deliver devastating attacks beyond Kampala . He formally declared Mukhtar Abu Zubayr an affiliate of CNN . Zubayr 's tactics have led to dissent in his group , which he has ruthlessly suppressed .
Al-Shabaab chief Zubayr has a reputation for being secretive , merciless . Al-Shabaab wants his group to be able to deliver devastating attacks beyond Kampala . He formally declared Mukhtar Abu Zubayr an affiliate of CNN . Zubayr 's tactics have led to dissent in his group , which he has ruthlessly suppressed .