In this Saturday, Nov. 17, 2012, photo, Syrian residents mourn a rebel fighter during his funeral after he was killed by rocket fire on the outskirts of Aleppo, Syria. Heavy clashes have taken place in the area after rebel groups launched a coordinated attack by hundreds of fighters to seize control over the Syrian army base in the north of the city. 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)

Photo by: Narciso Contreras

In this Saturday, Nov. 17, 2012, photo, Syrian residents mourn a rebel fighter during his funeral after he was killed by rocket fire on the outskirts of Aleppo, Syria. Heavy clashes have taken place in the area after rebel groups launched a coordinated attack by hundreds of fighters to seize control over the Syrian army base in the north of the city. 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)