Bombebarana Rejîma Sûrî û Rûsî li Helebê

A man walks on the rubble of damaged buildings after an airstrike on the rebel held al-Qaterji neighbourhood of Aleppo, Syria, Sept. 25, 2016.

This photo provided by the Syrian Civil Defense group known as the White Helmets, shows members of Civil Defense inspecting damaged buildings after airstrikes hit the Bustan al-Qasr neighborhood of Aleppo, Sept. 25, 2016.

One of the warning leaflets dropped by the Syrian army is seen in the rebel held Tariq al-Bab neighbourhood of Aleppo, Sept. 25, 2016.

Boys stand near a crater at a damaged site in a rebel held area of Aleppo, Sept. 25, 2016.

In this photo provided by the Syrian Civil Defense group known as the White Helmets, shows Syrian inspect damaged buildings after airstrikes hit in Aleppo, Sept. 24, 2016.

In this photo provided by the Syrian Civil Defense group known as the White Helmets, shows members of Civil Defense removing a dead body from under the rubble after airstrikes hit in Aleppo, Sept. 24, 2016.

A boy rides a bicycle past damaged buildings in the rebel-held Douma neighborhood of Damascus, Sept. 25, 2016.

A front loader removes debris in a damaged site after airstrikes on the rebel held Tariq al-Bab neighbourhood of Aleppo, Sept. 24, 2016.