NEW YORK, NY - SEPTEMBER 09: Metropolitan Transit Authority (MTA) police officers keep watch during the morning commute at Grand Central Terminal on September 9, 2011 in New York City. Security is ... more 
NEW YORK, NY - SEPTEMBER 09: Metropolitan Transit Authority (MTA) police officers keep watch during the morning commute at Grand Central Terminal on September 9, 2011 in New York City. Security is being tightened in New York and Washington, DC, following the detection of a possible terror threat tied to the tenth anniversary of the 9/11 terror attacks. New York City and the nation are preparing for the 10th anniversary of the terrorist attacks on lower Manhattan, which resulted in the deaths of 2,753 people at the World Trade Center. (Photo by Mario Tama/Getty Images) less 
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Getty Images | Photo By Mario Tama / Getty Images
Fri, Sep 9, 2011 10:21 AM EDT