Photo gallery: Aleppo airstrikes

A family walks 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.

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.

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.

Syrian civil defense volunteers evacuate a woman 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.

A Syrian family walks amid the rubble of destroyed buildings following a reported airstrike on April 28, 2016 in the Bustan al-Qasr rebel-held district of the northern Syrian city of Aleppo.

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.

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.