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Hamza bin Laden, son of deceased al-Qaeda leader Osama bin Laden, released an audio message encouraging lone wolf attacks in the West today. See photos of the heir to terror here. In a new audio message purportedly released by Hamza bin Laden, Hamza urges all "mujahideen" to travel to Syria to fight. Hamza was groomed by his father to be the heir of the bin Laden brand of terrorism. Hamza is 25 and was not present during the 2011 raid on his father's compound. (YouTube)