Civil defence members and civilians search for survivors after an air strike in rebel-held Douma. [Bassam Khabieh/Reuters]



The Syrian uprising started with largely unarmed protests against President Bashar al-Assad in March 2011, but quickly turned into a full-blown civil war that has since continued unabated. [Bassam Khabieh/Reuters]



Civilians walk past the site of an air strike in the rebel-held city of Douma on the outskirts of Damascus. [Bassam Khabieh/Reuters]



Boys salvage goods from the wreckage left behind after an air strike hit the rebel-held town of Atareb in Aleppo province. [Ammar Abdullah/Reuters]



People inspect the damage at a site hit by air strikes in the rebel-held town of Atareb in the countryside of Aleppo. [Ammar Abdullah/Reuters]



Civil defence members transport a casualty after an air strike hit the rebel held area of Douma, near the capital. [Bassam Khabieh/Reuters]


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Nearly 600,000 people live under siege in Syria, most of them encircled by President Bashar al-Assad's forces, whose approval the United Nations says is needed to deliver aid by air. [Bassam Khabieh/Reuters]



The UN's top aid official has called for a humanitarian truce in the city of Aleppo, where nearly 400,000 civilians are now under government siege. [Ammar Abdullah/Reuters]



A man takes pictures with his mobile phone at a site hit by an air strike. [Bassam Khabieh/Reuters]

Sources: Al Jazeera