A letter read on Jordanian television said the king took the action to allow Hamzeh to have more freedom of movement.
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Hamzeh, who is 24, is the son of American-born Queen Noor, the fourth wife of the late King Hussein.
Abdullah is the son of Hussein and his second wife, the British-born Princess Musa.
King Abdulluh named Hamzeh crown prince hours after their father died in 1999.
Some information for this report provided by AP and AFP.