WASHINGTON - SEPTEMBER 10: A police officer guards the Federal Reserve building on September 10, 2011 in Washington, DC. Ahead of tomorrow's tenth anniversary of the September 11 terrorist attacks, ... more 
WASHINGTON - SEPTEMBER 10: A police officer guards the Federal Reserve building on September 10, 2011 in Washington, DC. Ahead of tomorrow's tenth anniversary of the September 11 terrorist attacks, officials have warned of heightened security threats. (Photo by Brendan Hoffman/Getty Images) less 
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Getty Images | Photo By Brendan Hoffman / Getty Images
Sat, Sep 10, 2011 6:34 PM EDT