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TOPSHOT - Syrian men carrying babies make their way through the rubble of destroyed buildings following a reported air strike on the rebel-held Salihin neighbourhood of the northern city of Aleppo, on September 11, 2016. Air strikes have killed dozens in rebel-held parts of Syria as the opposition considers whether to join a US-Russia truce deal due to take effect on September 12. / AFP PHOTO / AMEER ALHALBI (Photo credit should read AMEER ALHALBI/AFP/Getty Images)

TOPSHOT - Syrian men carrying babies make their way through the rubble of destroyed buildings following a reported air strike on the rebel-held Salihin neighbourhood of the northern city of Aleppo, on September 11, 2016.
Air strikes have killed dozens in rebel-held parts of Syria as the opposition considers whether to join a US-Russia truce deal due to take effect on September 12. / AFP PHOTO / AMEER ALHALBI        (Photo credit should read AMEER ALHALBI/AFP/Getty Images)

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TOPSHOT - EDITORS NOTE: Graphic content / Syrian men remove a victim from under the rubble of destroyed buildings following a reported air strike on the rebel-held Salihin neighbourhood of the northern city of Aleppo, on September 11, 2016. Air strikes have killed dozens in rebel-held parts of Syria as the opposition considers whether to join a US-Russia truce deal due to take effect on September 12. / AFP / AMEER ALHALBI (Photo credit should read AMEER ALHALBI/AFP/Getty Images)

TOPSHOT - EDITORS NOTE: Graphic content / Syrian men remove a victim from under the rubble of destroyed buildings following a reported air strike on the rebel-held Salihin neighbourhood of the northern city of Aleppo, on September 11, 2016.
Air strikes have killed dozens in rebel-held parts of Syria as the opposition considers whether to join a US-Russia truce deal due to take effect on September 12. / AFP / AMEER ALHALBI        (Photo credit should read AMEER ALHALBI/AFP/Getty Images)

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TOPSHOT - A Syrian man comforts a boy amid the rubble of buildings following a reported air strike on the rebel-held neighbourhood of al-Kalasa in the northern Syrian city of Aleppo, on February 4, 2016. Tens of thousands of people were reported to have fled their homes in northern Syria as regime troops pressed a major Russian-backed offensive around second city Aleppo. Turkey's Prime Minister Ahmet Davotoglu warned that up to 70,000 people were headed towards his country, fleeing the offensive, which threatens to completely encircle rebels in Aleppo city. / AFP / THAER MOHAMMED (Photo credit should read THAER MOHAMMED/AFP/Getty Images)

TOPSHOT - A Syrian man comforts a boy amid the rubble of buildings following a reported air strike on the rebel-held neighbourhood of al-Kalasa in the northern Syrian city of Aleppo, on February 4, 2016.
Tens of thousands of people were reported to have fled their homes in northern Syria as regime troops pressed a major Russian-backed offensive around second city Aleppo. Turkey's Prime Minister Ahmet Davotoglu warned that up to 70,000 people were headed towards his country, fleeing the offensive, which threatens to completely encircle rebels in Aleppo city.

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

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TOPSHOT - Syrians evacuate an injured man amid the rubble of destroyed buildings following a reported air strike on the rebel-held neighbourhood of Al-Qatarji, in the northern Syrian city of Aleppo, on April 29, 2016. Fresh bombardment shook Syria's second city Aleppo, severely damaging a local clinic as outrage grows over an earlier air strike that destroyed a hospital. The northern city has been battered by a week of air strikes, rocket fire, and shelling, leaving more than 200 civilians dead across the metropolis. The renewed violence has all but collapsed a fragile ceasefire deal that had brought an unprecedented lull in fighting since February 27. / AFP / AMEER ALHALBI (Photo credit should read AMEER ALHALBI/AFP/Getty Images)

TOPSHOT - Syrians evacuate an injured man amid the rubble of destroyed buildings following a reported air strike on the rebel-held neighbourhood of Al-Qatarji, in the northern Syrian city of Aleppo, on April 29, 2016.
Fresh bombardment shook Syria's second city Aleppo, severely damaging a local clinic as outrage grows over an earlier air strike that destroyed a hospital. The northern city has been battered by a week of air strikes, rocket fire, and shelling, leaving more than 200 civilians dead across the metropolis. The renewed violence has all but collapsed a fragile ceasefire deal that had brought an unprecedented lull in fighting since February 27.  / AFP / AMEER ALHALBI        (Photo credit should read AMEER ALHALBI/AFP/Getty Images)

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EDITORS NOTE: Graphic content / Syrian rescue workers and residents try to pull a man out from under the rubble of a building following a reported air strike on the rebel-held neighbourhood of Salhin in the northern city of Aleppo on March 11, 2016. / AFP / THAER MOHAMMED (Photo credit should read THAER MOHAMMED/AFP/Getty Images)

EDITORS NOTE: Graphic content / Syrian rescue workers and residents try to pull a man out from under the rubble of a building following a reported air strike on the rebel-held neighbourhood of Salhin in the northern city of Aleppo on March 11, 2016. / AFP / THAER MOHAMMED        (Photo credit should read THAER MOHAMMED/AFP/Getty Images)