PARIS - OCTOBER 06: A French police patrol stands guard at the Gare du Nord on October 6, 2010 in Paris, France. Japan issued a security alert to it's nationals travelling to Europe, joining the ... more 
PARIS - OCTOBER 06: A French police patrol stands guard at the Gare du Nord on October 6, 2010 in Paris, France. Japan issued a security alert to it's nationals travelling to Europe, joining the United States and Britain in warning of a possible terrorist attack by al-Qaida or other groups. (Photo by Franck Prevel/Getty Images) less 
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Getty Images | Photo By Franck Prevel / Getty Images
Wed, Oct 6, 2010 5:10 PM EDT