TOPSHOT - People walk amid the rubble of destroyed buildings following a reported air strike on the rebel-held neighbourhood of al-Kalasa in the northern Syrian city of Aleppo, on April 28, 2016.
The death toll from an upsurge of fighting in Syria's second city Aleppo rose despite a plea by the UN envoy for the warring sides to respect a February ceasefire. / AFP / AMEER ALHALBI        (Photo credit should read AMEER ALHALBI/AFP/Getty Images)
Syrian doctor: 'Aleppo is burning'
Michael Holmes talks to Dr. Osama Abu El Ezz, a surgeon from Aleppo, after a deadly airstrike on a pediatric hospital leaves several of his friends dead.
09:05 - Source: CNN
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TOPSHOT - People walk amid the rubble of destroyed buildings following a reported air strike on the rebel-held neighbourhood of al-Kalasa in the northern Syrian city of Aleppo, on April 28, 2016.
The death toll from an upsurge of fighting in Syria's second city Aleppo rose despite a plea by the UN envoy for the warring sides to respect a February ceasefire. / AFP / AMEER ALHALBI        (Photo credit should read AMEER ALHALBI/AFP/Getty Images)
Syrian doctor: 'Aleppo is burning'
09:05
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- Source: CNN