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People buy fruits and vegetables at a market in the Syrian city of Raqa on May 17, 2018, during the holy month of Ramadan. - The Syrian Democratic forces (SDF) recently drove the Islamic State (IS) group out of large parts of northern and eastern Syria, including the onetime jihadist capital of Raqa, with help from the coalition's air strikes, weapons and special forces advisors. (Photo by Delil souleiman / AFP) (Photo credit should read DELIL SOULEIMAN/AFP via Getty Images)

People buy fruits and vegetables at a market in the Syrian city of Raqa on May 17, 2018, during the holy month of Ramadan. - The Syrian Democratic forces (SDF) recently drove the Islamic State (IS) group out of large parts of northern and eastern Syria, including the onetime jihadist capital of Raqa, with help from the coalition's air strikes, weapons and special forces advisors. (Photo by Delil souleiman / AFP)        (Photo credit should read DELIL SOULEIMAN/AFP via Getty Images)

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A tractor clears the rubble following Syrian govermnet forces airstrikes in the rebel held neighborhood of Tariq a-Bab in Aleppo on September 24, 2016. Residents in Syria's battleground city of Aleppo cowered indoors as fierce air strikes toppled buildings and killed at least 52 civilians, after diplomatic efforts to revive a ceasefire failed. / AFP / THAER MOHAMMED (Photo credit should read THAER MOHAMMED/AFP via Getty Images)

A tractor clears the rubble following Syrian govermnet forces airstrikes in the rebel held neighborhood of Tariq a-Bab in Aleppo on September 24, 2016. 
Residents in Syria's battleground city of Aleppo cowered indoors as fierce air strikes toppled buildings and killed at least 52 civilians, after diplomatic efforts to revive a ceasefire failed.

 / AFP / THAER MOHAMMED        (Photo credit should read THAER MOHAMMED/AFP via Getty Images)