A soldier patrols at Gare du Nord train station in Paris, Monday, Oct.4, 2010. Japan issued a travel alert for Europe on Monday, joining the United States and Britain in warning of a possible ... more 
A soldier patrols at Gare du Nord train station in Paris, Monday, Oct.4, 2010. Japan issued a travel alert for Europe on Monday, joining the United States and Britain in warning of a possible terrorist attack by al-Qaida or other groups, but tourists appeared to be taking the mounting warnings in stride. At right is a board signaling security measures. less 
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Associated Press | Photo By Remy de la Mauviniere
Tue, Oct 5, 2010 7:07 PM EDT