Civil defence members carry a casualty after an airstrike at a field hospital in the rebel held area of al-Sukari district of Aleppo, Syria April 27, 2016. (Photo by Abdalrhman Ismail/Reuters)





Burnt vehicles are pictured in front of the damaged the Medecins Sans Frontieres (MSF)-backed al-Quds hospital after it was hit by airstrikes, in a rebel-held area of Syria's Aleppo, April 28, 2016. (Photo by Abdalrhman Ismail/Reuters)





People inspect the damage at a site hit by airstrikes, in the rebel-held area of Aleppo's Bustan al-Qasr, Syria April 28, 2016. (Photo by Abdalrhman Ismail/Reuters)





People inspect the damage at a site hit by airstrikes, in the rebel-held area of Aleppo's Bustan al-Qasr, Syria April 28, 2016. (Photo by Abdalrhman Ismail/Reuters)





People inspect the damage at a site hit by airstrikes, in the rebel-held area of Aleppo's Bustan al-Qasr, Syria April 28, 2016. (Photo by Abdalrhman Ismail/Reuters)





A front loader operates at a site hit by airstrikes in the rebel held area of al-Sukari district of Aleppo, Syria, April 28, 2016. (Photo by Abdalrhman Ismail/Reuters)





A man gestures as he stands on a damaged building at a site hit by airstrikes in the rebel held area of al-Kalaseh neighbourhood of Aleppo, Syria, April 28, 2016. (Photo by Abdalrhman Ismail/Reuters)





A man reacts at a site hit by airstrikes in the rebel held area of al-Kalaseh neighbourhood of Aleppo, Syria, April 28, 2016. (Photo by Abdalrhman Ismail/Reuters)





People inspect the damage at a site hit by airstrikes, in the rebel-held area of Aleppo's Bustan al-Qasr, Syria April 28, 2016. (Photo by Abdalrhman Ismail/Reuters)





An injured woman reacts at a site hit by airstrikes in the rebel held area of Old Aleppo, Syria, April 28, 2016. (Photo by Abdalrhman Ismail/Reuters)





An injured woman reacts at a site hit by airstrikes in the rebel held area of Old Aleppo, Syria, April 28, 2016. (Photo by Abdalrhman Ismail/Reuters)





A woman, who survived an airstrike, sits amid the damage in the rebel held area of Old Aleppo, Syria, April 28, 2016. (Photo by Abdalrhman Ismail/Reuters)





A civil defence member carries a child that survived from under the rubble at a site hit by airstrikes in the rebel held area of Old Aleppo, Syria, April 28, 2016. (Photo by Abdalrhman Ismail/Reuters)





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. (Photo by Ameer Alhalbi/AFP Photo)





Syrian civil defence volunteers and rescuers remove a baby from under the rubble of a destroyed building following a reported air strike on the rebel-held neighbourhood of al-Kalasa in the northern Syrian city of Aleppo, on April 28, 2016. (Photo by Ameer Alhalbi/AFP Photo)





Syrian civil defence volunteers and rescuers remove a baby from under the rubble of a destroyed building following a reported air strike on the rebel-held neighbourhood of al-Kalasa in the northern Syrian city of Aleppo, on April 28, 2016. (Photo by Ameer Alhalbi/AFP Photo)





Syrian men carry an injured youth in the government-controlled side of the northern city of Aleppo following fighting between regime forces and rebels on April 28, 2016. The Syrian army was preparing an offensive to retake the whole of Aleppo, as fighting in the divided second city killed 38 civilians in a new blow for a tattered truce. Nearly 200 people have been killed in Aleppo in the past week as rebels have pounded government-held neighbourhoods with rocket and artillery fire and the regime has hit rebel areas with air raids. UN envoy Staffan de Mistura warned the hard-won February 27 ceasefire was now “barely alive” and pleaded for urgent action by its cosponsors Russia and the United States to rescue it. But pro-government newspaper Al-Watan said the army was now poised for a “decisive battle” for Aleppo and the surrounding province which would begin in the coming days. (Photo by George Ourfalian/AFP Photo)





A man follows rescuers carrying the body of a boy on a stretcher following a reported air strike on the rebel-held neighbourhood of al-Kalasa in the northern Syrian city of Aleppo, on April 28, 2016. (Photo by Ameer Alhalbi/AFP Photo)





A Syrian boy is comforted as he cries next to the body of a relative who died in a reported airstrike on April 27, 2016 in the rebel-held neighbourhood of al-Soukour in the northern city of Aleppo. (Photo by Karam Al-Masri/AFP Photo)