The Syrian Observatory for Human Rights says government air raids have killed nearly 2,000 civilians this year in and around Aleppo, the country's largest city.
Images from Aleppo
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A man carries his belongings as he walks among debris from a collapsed buildings hit by what activists said was a barrel bomb dropped by forces loyal to President Bashar al-Assad, Bustan al-Qasr, Aleppo, May 28, 2014.
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People stand near damaged buildings hit by what activists said was a barrel bomb dropped by forces loyal to President Bashar al-Assad, Bustan al-Qasr, Aleppo, May 28, 2014.