Nineteen children and two teachers were killed in Uvalde, Texas, last month.
The doctor told US lawmakers about the scene in the hospital.
Two victims were "pulverized" by bullets and were only recognizable by their clothes.
Two children who were wounded in the Uvalde shooting were only identified by their blood-spattered cartoon clothes, according to a doctor.
Nineteen children and two teachers were killed in a shooting at an elementary school in Uvalde, Texas.
The doctor who worked at Uvalde Memorial Hospital on the day of the shooting gave testimony to the House.
There were two dead children who had been moved to the surgical area of the hospital. He said that he found something no prayer would ever cure.
The only clue as to their identities was the blood-spattered cartoon clothes still clinging to them. Figuring out how to live and find nothing.
I hoped the two bodies were not an exception to the list of survivors. He said that as he waited there with his fellow Uvalde doctors, nurses, first responders and hospital staff for other casualties, they never arrived.
According to reports at the time, the shooter used a rifle that he had purchased days prior to the shooting.
Parents of Robb Elementary students waiting for news were asked to give samples of their children's saliva to be compared to their families.
In a speech delivered at the White House on Tuesday, the actor Matthew McConaughey, who was born in Uvalde, held up a pair of green trainers and said they were the only thing that authorities were able to use to identify Maite Rodriguez.
The only clear evidence that could identify her after the shooting was the green sneakers she wore.
Ahead of a vote on a bill proposing a slew of new restrictions, the House is discussing the need for gun control.
Since Uvalde there have been 33 more mass shootings.
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