An Amtrack police officer checks commuter bags as passengers get ready to board their train at Pennsylvania Station on Friday, Sept. 9, 2011 in New York. The city is deploying additional resources and... more 
An Amtrack police officer checks commuter bags as passengers get ready to board their train at Pennsylvania Station on Friday, Sept. 9, 2011 in New York. The city is deploying additional resources and taking other security steps in response to a potential terror threat 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 or Washington. (AP Photo/Jin Lee) less 
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Associated Press | Photo By Jin Lee
Fri, Sep 9, 2011 10:46 AM EDT