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Syrians transport an injured youth in the back of a pickup truck in the rebel-held area of Daraa, in southern Syria, on February 4, 2017. / AFP / MOHAMAD ABAZEED (Photo credit should read MOHAMAD ABAZEED/AFP/Getty Images)

Syrians transport an injured youth in the back of a pickup truck in the rebel-held area of Daraa, in southern Syria, on February 4, 2017. / AFP / MOHAMAD ABAZEED        (Photo credit should read MOHAMAD ABAZEED/AFP/Getty Images)

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Syrians watch as another man rides on the turret of a movin tank in the rebel-held area of Daraa, in southern Syria, on February 4, 2017. / AFP / MOHAMAD ABAZEED (Photo credit should read MOHAMAD ABAZEED/AFP/Getty Images)

Syrians watch as another man rides on the turret of a movin tank in the rebel-held area of Daraa, in southern Syria, on February 4, 2017. / AFP / MOHAMAD ABAZEED        (Photo credit should read MOHAMAD ABAZEED/AFP/Getty Images)

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TOPSHOT - Syrians carry an injured youth on a stretcher pickup truck in the rebel-held area of Daraa, in southern Syria, on February 4, 2017. / AFP / MOHAMAD ABAZEED (Photo credit should read MOHAMAD ABAZEED/AFP/Getty Images)

TOPSHOT - Syrians carry an injured youth on a stretcher pickup truck in the rebel-held area of Daraa, in southern Syria, on February 4, 2017. / AFP / MOHAMAD ABAZEED        (Photo credit should read MOHAMAD ABAZEED/AFP/Getty Images)

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Smoke billows following a reported air strike by Syrian government forces in a rebel-held area of Daraa, in southern Syria, on December 2, 2016. / AFP / MOHAMAD ABAZEED (Photo credit should read MOHAMAD ABAZEED/AFP/Getty Images)

Smoke billows following a reported air strike by Syrian government forces in a rebel-held area of Daraa, in southern Syria, on December 2, 2016. / AFP / MOHAMAD ABAZEED        (Photo credit should read MOHAMAD ABAZEED/AFP/Getty Images)

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Syrian men ride a motorbike past a damaged mosque in a rebel-held area of Daraa, in southern Syria, on March 28, 2016. / AFP / MOHAMAD ABAZEED (Photo credit should read MOHAMAD ABAZEED/AFP/Getty Images)

Syrian men ride a motorbike past a damaged mosque in a rebel-held area of Daraa, in southern Syria, on March 28, 2016. / AFP / MOHAMAD ABAZEED        (Photo credit should read MOHAMAD ABAZEED/AFP/Getty Images)