French soldiers patrol the area under the Eiffel Tower and walk past replicas for sale, in Paris, Sunday, Oct. 3, 2010. The State Department plans to caution Americans traveling in Europe to be vigilant because of heightened concerns about a potential al-Qaida terrorist attack aimed at U.S. citizens and Europeans. The travel alert expected to come out Sunday is for travelers' guidance, is general in nature and isn't intended to focus on any specific country, location or tourist sites. (AP Photo/Laurent Cipriani)

Associated Press
French soldiers patrol the area under the Eiffel Tower and walk past replicas for sale, in Paris, Sunday, Oct. 3, 2010. The State Department plans to caution Americans traveling in Europe to be vigilant because of heightened concerns about a potential al-Qaida terrorist attack aimed at U.S. citizens and Europeans. The travel alert expected to come out Sunday is for travelers' guidance, is general in nature and isn't intended to focus on any specific country, location or tourist sites. (AP Photo/Laurent Cipriani)
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French soldiers patrol the area under the Eiffel Tower and walk past replicas for sale, in Paris, Sunday, Oct. 3, 2010. The State Department plans to caution Americans traveling in Europe to be vigilant because of heightened concerns about a potential al-Qaida terrorist attack aimed at U.S. citizens and Europeans. The travel alert expected to come out Sunday is for travelers' guidance, is general in nature and isn't intended to focus on any specific country, location or tourist sites.

French soldiers patrol the area under the Eiffel Tower and walk past replicas for sale, in Paris, Sunday, Oct. 3, 2010. The State Department plans to caution Americans traveling in Europe to be vigilant because of heightened concerns about a potential al-Qaida terrorist attack aimed at U.S. citizens and Europeans. The travel alert expected to come out Sunday is for travelers' guidance, is general in nature and isn't intended to focus on any specific country, location or tourist sites. (AP Photo/Laurent Cipriani)

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