Syrian and Russian jet fighters pounded the city's residential communities where an estimated 250,000 people live, flattening buildings and leaving streets filled with debris and chunks of concrete.
Syria, Russia Bombard Aleppo

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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.

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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.

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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.

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