‘These children are barefoot. In diapers. Choking on tear gas.’

A little girl from Honduras stares into the camera, her young features contorted in anguish. She’s barefoot, dusty, and clad only in a diaper and T-shirt. And she’s just had to run from clouds of choking tear gas fired across the border by U.S. agents.

A second photograph, which also circulated widely and rapidly on social media, shows an equally anguished woman frantically trying to drag the same child and a second toddler away from the gas as it spreads.