In 2012, its General Guide (leader) in Egypt, Mohammed Badie also declared jihad "to save Jerusalem from the usurpers and to [liberate] Palestine from the claws of occupation ... a personal duty for all Muslims." Muslims "must participate in jihad by [donating] money or [sacrificing] their life ..." Many other prominent figures in global jihad started with militancy in the Muslim Brotherhood—Abdullah Azzam, Osama bin Laden's mentor, started in the Muslim Brotherhood of Jordan; Ayman al-Zawahiri, bin Laden's deputy, joined the Egyptian Muslim Brotherhood at the age of 14; and Khalid Sheikh Mohammed, who planned the September 11 attacks of 2001, claims to have joined the Kuwaiti Muslim Brotherhood at age 16.&lt;ref name="9/11 commission"&gt;&lt;/ref&gt;