Osama bin Laden was a Saudi Arabian-born Islamist dissident and militant leader who was the founder and first general emir of al-Qaeda. Ideologically a pan-Islamist, he participated in the Afghan jihad against the Soviet Union and supported the activities of the Bosnian mujahideen during the Yugoslav Wars. After issuing his declaration of war against the Americans in 1996, Bin Laden began advocating attacks targeting U.S. assets in several countries, and supervised al-Qaeda’s execution of the September 11 attacks in the United States in 2001.