Editor's note: This story contains descriptions of dead bodies.
On a busy street corner in Raqqa, Syria, a digger pushes through the rubble of a building hit by an airstrike. Onlookers shield their mouths and noses from the dust and stench of corpses of those who perished beneath.
Just streets away, three recovery workers pull out the delicate skeletons of two children from under the debris of a partially collapsed home. And across the city, in what was once Raqqa's public park, men unearth more bodies from a mass grave.