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Vietnam’s president, Tran Dai Quang, one of the three most powerful leaders in the country despite his largely ceremonial role, died Friday at age 61, according to state media. Quang died in a military hospital in Hanoi after “best efforts to treat him by Vietnamese and foreign doctors,” said an announcement on state media. It did not elaborate on his illness or the specific cause of his death. His death opens up a "power vacuum" in the communist country, which has no paramount head of state. Power is shared among the president, the prime minister, the Communist Party chief and the head of the legislature, the National Assembly.