Police officers ride the shuttle between New York's Times Square and Grand Central Station, Friday, Sept. 9, 2011. Just days before the 10th anniversary of the Sept. 11 attacks, U.S. counterterrorism ... more 
Police officers ride the shuttle between New York's Times Square and Grand Central Station, Friday, Sept. 9, 2011. Just days before the 10th anniversary of the Sept. 11 attacks, U.S. counterterrorism officials are chasing a credible but unconfirmed al-Qaida threat to use a car bomb on bridges or tunnels in New York City or Washington. New York City commuters were told to expect a show of force at Grand Central Terminal, Penn Station and the Times Square subway station because of a previously planned counterterror drill. (AP Photo/Mary Altaffer) less 
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Associated Press | Photo By Mary Altaffer
Fri, Sep 9, 2011 8:54 AM EDT