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TOPSHOT - A Syrian civil defence volunteer evacuates a woman following a reported airstrike on April 23, 2016 in the rebel-held neighbourhood of Tareeq al-Bab in the northern city of Aleppo. The barrage of air strikes on Aleppo began around 10:00 local time and hit several neighbourhoods, including the heavily-populated Bustan al-Qasr district, an AFP correspondent in the city said. But the deadliest raid was on the Tareeq al-Bab neighbourhood on the eastern edges of the city. / AFP / AMEER ALHALBI (Photo credit should read AMEER ALHALBI/AFP/Getty Images)

TOPSHOT - A Syrian civil defence volunteer evacuates a woman following a reported airstrike on April 23, 2016 in the rebel-held neighbourhood of Tareeq al-Bab in the northern city of Aleppo.
The barrage of air strikes on Aleppo began around 10:00 local time and hit several neighbourhoods, including the heavily-populated Bustan al-Qasr district, an AFP correspondent in the city said. But the deadliest raid was on the Tareeq al-Bab neighbourhood on the eastern edges of the city.  / AFP / AMEER ALHALBI        (Photo credit should read AMEER ALHALBI/AFP/Getty Images)