Four months after Zawahiri was reportedly killed in a drone strike in Kabul, the terrorist organization still has not announced a successor.
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The U.S. killing of the al-Qaeda leader in Afghanistan was not justified in self-defense or under the international law of war or international human rights law. It looks more like an extrajudicial execution, or revenge murder, for past acts of terrorism.
Bin Laden's successor steered the organization through a tumultuous decade and left it stagnated, but the next leader will have new opportunities for growth.