FILE - In this Sunday, March 11, 2012 file photo, Free Syrian Army fighters celebrate after hearing that their comrades destroyed a Syrian Army tank in Idlib, north Syria. In the previous days, troops had encircled Idlib, and tank shells pounded the city from dawn until evening. Rebels dashed through the streets, taking cover behind the corners of buildings as they clashed with the troops. Wounded fighters were piled into trucks bound for makeshift clinics. (AP Photo/Rodrigo Abd, File)

Associated Press
FILE - In this Sunday, March 11, 2012 file photo, Free Syrian Army fighters celebrate after hearing that their comrades destroyed a Syrian Army tank in Idlib, north Syria.  In the previous days, troops had encircled Idlib, and tank shells pounded the city from dawn until evening. Rebels dashed through the streets, taking cover behind the corners of buildings as they clashed with the troops. Wounded fighters were piled into trucks bound for makeshift clinics. (AP Photo/Rodrigo Abd, File)
FILE - In this Sunday, March 11, 2012 file photo, Free Syrian Army fighters celebrate after hearing that their comrades destroyed a Syrian Army tank in Idlib, north Syria. In the previous days, troops had encircled Idlib, and tank shells pounded the city from dawn until evening. Rebels dashed through the streets, taking cover behind the corners of buildings as they clashed with the troops. Wounded fighters were piled into trucks bound for makeshift clinics. (AP Photo/Rodrigo Abd, File)
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