U.S. government urges Americans citizens to move 12 miles away . Japan calls for evacuations within 50 miles . U.S. officials say the difference reflects how each country analyzes information . It 's the first time since the disaster State Department officials could not explain why the military was concerned about U.S. military operating in the area but the State Department did not feel a need to warn American citizens until early Thursday in Japan . that the 160,000 differed on advising their citizens .
U.S. government urges Americans citizens to move 12 miles away . Japan calls for evacuations within 50 miles . U.S. officials say the difference reflects how each country analyzes information . It 's the first time since the disaster that the 160,000 differed on advising their citizens .