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ALEPPO, SYRIA - DECEMBER 15: An aerial view show a convoy including busses and ambulances, wait at a crossing point at Amiriyah District of Aleppo, Syria on December 15, 2016 to evacuate civilians, trying to flee from East Aleppo where had been under siege by Iran led Shiite militias and Assad Regime forces. (Photo by Hasan Katan/Anadolu Agency/Getty Images)

ALEPPO, SYRIA - DECEMBER 15: An aerial view show a convoy including busses and ambulances, wait at a crossing point at Amiriyah District of Aleppo, Syria on December 15, 2016 to evacuate civilians, trying to flee from East Aleppo where had been under siege by Iran led Shiite militias and Assad Regime forces. (Photo by Hasan Katan/Anadolu Agency/Getty Images)

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ALEPPO, SYRIA - DECEMBER 15: A convoy including busses and ambulances, wait at a crossing point at Amiriyah District of Aleppo Syria on December 15, 2016 to evacuate civilians, trying to flee from East Aleppo where had been under siege by Iran led Shiite militias and Assad Regime forces. (Photo by Mamun Ebu Omer/Anadolu Agency/Getty Images)

ALEPPO, SYRIA - DECEMBER 15: A convoy including busses and ambulances, wait at a crossing point at Amiriyah District of Aleppo Syria on December 15, 2016 to evacuate civilians, trying to flee from East Aleppo where had been under siege by Iran led Shiite militias and Assad Regime forces.
 (Photo by Mamun Ebu Omer/Anadolu Agency/Getty Images)

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ALEPPO, SYRIA - DECEMBER 15: A convoy including busses and ambulances, wait at a crossing point at Amiriyah District of Aleppo Syria on December 15, 2016 to evacuate civilians, trying to flee from East Aleppo where had been under siege by Iran led Shiite militias and Assad Regime forces. (Photo by Jawad al Rifai/Anadolu Agency/Getty Images)

ALEPPO, SYRIA - DECEMBER 15: A convoy including busses and ambulances, wait at a crossing point at Amiriyah District of Aleppo Syria on December 15, 2016 to evacuate civilians, trying to flee from East Aleppo where had been under siege by Iran led Shiite militias and Assad Regime forces. (Photo by Jawad al Rifai/Anadolu Agency/Getty Images)

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ALEPPO, SYRIA - DECEMBER 15: A convoy including busses and ambulances, wait at a crossing point at Amiriyah District of Aleppo Syria on December 15, 2016 to evacuate civilians, trying to flee from East Aleppo where had been under siege by Iran led Shiite militias and Assad Regime forces. (Photo by Jawad al Rifai/Anadolu Agency/Getty Images)

ALEPPO, SYRIA - DECEMBER 15: A convoy including busses and ambulances, wait at a crossing point at Amiriyah District of Aleppo Syria on December 15, 2016 to evacuate civilians, trying to flee from East Aleppo where had been under siege by Iran led Shiite militias and Assad Regime forces. (Photo by Jawad al Rifai/Anadolu Agency/Getty Images)

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ALEPPO, SYRIA - DECEMBER 15: A convoy including busses and ambulances, wait at a crossing point at Amiriyah District of Aleppo Syria on December 15, 2016 to evacuate civilians, trying to flee from East Aleppo where had been under siege by Iran led Shiite militias and Assad Regime forces. (Photo by Jawad al Rifai/Anadolu Agency/Getty Images)

ALEPPO, SYRIA - DECEMBER 15: A convoy including busses and ambulances, wait at a crossing point at Amiriyah District of Aleppo Syria on December 15, 2016 to evacuate civilians, trying to flee from East Aleppo where had been under siege by Iran led Shiite militias and Assad Regime forces. (Photo by Jawad al Rifai/Anadolu Agency/Getty Images)