Members of Free Syrian Army clash against Syrian regime forces in Aleppo, Syria on Dec. 8, 2014.
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Smoke rises after military airstrikes hit the town of Talbiseh in the Homs province, Syria, on Sept. 30, 2015.
Homs Media Center/Associated Press
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A Syrian girl who took shelter in Turkey sleeps on the ground before she crosses into Kobani through Mursitpinar border crossing in the Suruc district of Sanliurfa, Turkey on March 6, 2015.
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A man prepares to attack Syrian regime forces in Aleppo, Syria, on Oct. 8, 2015.
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A member of the Syrian opposition prepares to attack Syrian regime forces in Aleppo, Syria, on Oct. 8, 2015.
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A car passes an area that was destroyed in a clash between U.S.-backed Kurdish forces and the Islamic State in Kobani, Syria, on April 18, 2015.
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Smoke rises from the Dareyya district after a Syrian Air Force barrel bomb attack in Damascus, Syria, on March 6, 2015.
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People inspect the debris caused by an airstrike in Talbiseh, Syria, on Sept. 30, 2015.
Syria Civil Defense/Associated Press
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Smoke rises after airstrikes in Kafr Nabel, a town in the western Syrian province of Idlib, on Oct. 1, 2015.
Hadi Al-Abdallah/Associated Press
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Syrian oppositions attack Syrian regime forces in Aleppo, Syria, on Oct. 8, 2015.
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Damaged buildings are seen following clashes between regime forces and the Damascus Front in Damascus, Syria on March 6, 2015.
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A Syrian man prays over the grave of his son, who was killed during shelling, at a cemetery in the rebel-held Damascus suburb of Douma, on March 5, 2015.
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A member of Syrian opposition group linked to Damascus Front launches a rocket toward Assad's forces in Aleppo, Syria, on March 7, 2015.
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AÂ rocket is fired toward Assad's forces in Aleppo, Syria, on March 7, 2015.
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A Syrian boy who took shelter in Turkey with his family crosses into Kobani through Mursitpinar border crossing in the Suruc district of Sanliurfa, Turkey on March 6, 2015.
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Syrian fire fighters put out a blaze at the scene of a reported barrel bomb strike by Syrian government forces on the Qadi Askar rebel-held district of the northern Syrian city of Aleppo, March 5, 2015.
ZEIN AL-RIFAI/AFP/Getty Images
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Syrians inspect the debris of houses in Dareyya district after a Syrian Air Force barrel bomb attack in Damascus, Syria, on March 3, 2015.
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A rebel fighter holds his rifle inside a damaged building during clashes between regime forces and the Damascus Front in Damascus, Syria on March 6, 2015.
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Syrian opponents stage a missile attack against the Hemeimeem military airport, which was being used by the Russian military at the time, in Latakia, Syria, on Sept. 28, 2015.
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A vehicle arrives to the scene of an airstrike in Talbiseh, Syria, on Sept. 30, 2015.
Syria Civil Defense/Associated Press
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Syrians search for survivors in the rubble of destroyed buildings following barrel bomb attacks by the Syrian air forces in Aleppo, Syria, on Oct. 8, 2015.
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A man sits by a damaged building after Syrian regime army helicopters dropped barrel bombs in opposition-controlled territory in Aleppo, Syria, on July 16, 2014.
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A man carries a child following barrel bomb attacks by Syrian air forces in Aleppo, Syria, on Dec. 23, 2013.
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A member of Syria's opposition group launches a rocket toward Assad's forces in Aleppo, Syria, on March 7, 2015.
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AÂ member of Syria's opposition group fires toward Assad's forces in Aleppo, Syria, on March 2, 2015.
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