07/22/2011 08:55 am ET | Updated Sep 21, 2011

Janet Napolitano: Aviation Is Still Biggest Terror Target

Terrorists continue to target aviation more than any other U.S. vulnerability, according to Department of Homeland Securiy secretary Janet Napolitano.

As the 10th anniversary of the September 11 attacks draw near, she said she expects Americans to question whether or not we are safer now than a decade ago. "The answer is yes, but there are no guarantees in a world of ever-evolving threats," she told the Associated Press.

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