Passengers enter a gate at Washington Dulles International Airport in Chantilly, Va., Saturday, Sept. 10, 2011. Police and FBI agents remain on high alert as investigators look for proof of a plot ... more 
Passengers enter a gate at Washington Dulles International Airport in Chantilly, Va., Saturday, Sept. 10, 2011. Police and FBI agents remain on high alert as investigators look for proof of a plot against Washington or New York. By Saturday, there was still no intelligence backing that up and officials continued to question the validity of the initial information. (AP Photo/Luis M. Alvarez) less 
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Associated Press | Photo By Luis M. Alvarez
Sat, Sep 10, 2011 9:00 PM EDT