CNN:

(CNN)Every so often, a photograph cuts through the grim cacophony of the war in Syria and pierces viewers' hearts.

It happened in 2015 with an image of the lifeless body of Alan Kurdi, face down on a beach in Turkey, who drowned in the Mediterranean fleeing the war.
It happened last year when a photographer captured little Omran Daqneesh sitting in an ambulance, his body bloodied and dusty after his home was bombed in Aleppo.

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