In this Friday, Dec. 07, 2012 photo, Syrian rebels throw a smoke 

In this Friday, Dec. 07, 2012 photo, Syrian rebels throw a smoke device during clashes with troops loyal to President Bashar Assad in Aleppo, Syria. As fears grow in the West that Assad will unleash chemical weapons as an act of desperation, NATO moved forward Thursday with its plan to place Patriot missiles and troops along Syria's border with Turkey to protect against potential attacks. (AP Photo/Narciso Contreras)
Associated Press
In this Friday, Dec. 07, 2012 photo, Syrian rebels throw a smoke device during clashes with troops loyal to President Bashar Assad in Aleppo, Syria. As fears grow in the West that Assad will unleash chemical weapons as an act of desperation, NATO moved forward Thursday with its plan to place Patriot missiles and troops along Syria's border with Turkey to protect against potential attacks. (AP Photo/Narciso Contreras)
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