This story includes graphic photographs of injured children.

(CNN) For one Yemeni father, any hope that his son was alive was crushed when he spotted a body in the back of a pickup, the corpse partially covered by a blue tarpaulin.

"Is this Yousif? Is this Yousif?" he cries as he grabs at the side of the vehicle and begins to shake it: "Oh my God!"

Pain is etched across his face as the reality sinks in.

"Oh Yousif, oh Yousif," he wails, his voice rising to a scream.

"What is the fault of these small children?" he asks of no one in particular.

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