Syrians evacuate a toddler from 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 (AFP)
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 (AFP)
An injured woman reacts at a site hit by airstrikes in the rebel held area of Old Aleppo, Syria, April 28, 2016 (Reuters)
TOPSHOT - A man gestures 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 (AFP)
Syrians 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 (AFP)
This image made from video and posted online from Validated UGC, shows smoke rising from buildings after airstrikes hit Aleppo, Syria, Thursday, April 28, 2016 (AP)
An injured man reacts at a site hit by airstrikes, in the rebel-held area of Aleppo's Bustan al-Qasr, Syria April 29, 2016 (Reuters)
Smoke rises after airstrikes on the rebel-held al-Sakhour neighborhood of Aleppo, Syria April 29, 2016 (Reuters)
Residents look out from balconies at a site hit by airstrikes, in the rebel-held area of Aleppo's Bustan al-Qasr, Syria April 29, 2016 (Reuters)
Syrian men carry a body on a stretcher 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 (AFP)
A Syrian family runs for cover 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 (AFP)
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 (AFP)
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 (AFP)
A man reacts after a reported air strike on the rebel-held neighbourhood of al-Kalasa in the northern Syrian city of Aleppo, on April 28, 2016 (AFP)