In this Sunday, Oct. 28, 2012 photo, a rebel fighter throws a 

In this Sunday, Oct. 28, 2012 photo, a rebel fighter throws a homemade grenade towards Syrian army troops at the frontline in the Bustan Al-Pasha neighborhood of Aleppo, Syria. Syria's air force fired missiles and dropped barrel bombs on rebel strongholds while opposition fighters attacked regime positions, flouting a U.N.-backed cease-fire that was supposed to quiet fighting over a long holiday weekend but never took hold. (AP Photo/Narciso Contreras).
Associated Press
In this Sunday, Oct. 28, 2012 photo, a rebel fighter throws a homemade grenade towards Syrian army troops at the frontline in the Bustan Al-Pasha neighborhood of Aleppo, Syria. Syria's air force fired missiles and dropped barrel bombs on rebel strongholds while opposition fighters attacked regime positions, flouting a U.N.-backed cease-fire that was supposed to quiet fighting over a long holiday weekend but never took hold. (AP Photo/Narciso Contreras).
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