In this Saturday, Nov. 17, 2012 photo, Syrian rebel fighters prepare to fire a homemade rocket as they carry out a coordinated attack by hundreds of rebel fighters on a Syrian air force compound during heavy clashes on the outskirts of Aleppo, Syria. There is a struggle for power among rebel factions in Syria with Islamists rejecting the country's new Western-backed opposition coalition and unilaterally declaring an Islamic state in the key battleground of Aleppo though all of the groups are fighting to topple President Bashar Assad. (AP Photo/Narciso Contreras)

Associated Press
In this Saturday, Nov. 17, 2012 photo, Syrian rebel fighters prepare to fire a homemade rocket as they carry out a coordinated attack by hundreds of rebel fighters on a Syrian air force compound during heavy clashes on the outskirts of Aleppo, Syria. There is a struggle for power among rebel factions in Syria with Islamists rejecting the country's new Western-backed opposition coalition and unilaterally declaring an Islamic state in the key battleground of Aleppo though all of the groups are fighting to topple President Bashar Assad. (AP Photo/Narciso Contreras)
In this Saturday, Nov. 17, 2012 photo, Syrian rebel fighters prepare to fire a homemade rocket as they carry out a coordinated attack by hundreds of rebel fighters on a Syrian air force compound during heavy clashes on the outskirts of Aleppo, Syria. There is a struggle for power among rebel factions in Syria with Islamists rejecting the country's new Western-backed opposition coalition and unilaterally declaring an Islamic state in the key battleground of Aleppo though all of the groups are fighting to topple President Bashar Assad. (AP Photo/Narciso Contreras)
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