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Washington, UNITED STATES:  The terrorist threat advisory is seen 10 August, 2006 at Ronald Reagan National Airport, in Washington, DC. After Britain said 10 August it had thwarted a plot to wreak "mass murder" by the simultaneous mid-air bombings of planes to the United States, the US raised the threat level to "severe" or "Red" for all commercial flights flying from Britain to the United States, and "high" or "Orange" for all commercial aviation operating in the United States, including international flights.  AFP PHOTO / TIM SLOAN  (Photo credit should read TIM SLOAN/AFP/Getty Images)
Washington, UNITED STATES:  The terrorist threat advisory is seen 10 August, 2006 at Ronald Reagan National Airport, in Washington, DC. After Britain said 10 August it had thwarted a plot to wreak "mass murder" by the simultaneous mid-air bombings of planes to the United States, the US raised the threat level to "severe" or "Red" for all commercial flights flying from Britain to the United States, and "high" or "Orange" for all commercial aviation operating in the United States, including international flights.  AFP PHOTO / TIM SLOAN  (Photo credit should read TIM SLOAN/AFP/Getty Images)

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