A gunman killed 19 children and two teachers at an elementary school in Uvalde, Texas, last month.
A local pediatrician recounted the scene in the hospital afterwards to US lawmakers on Wednesday.
Dr. Roy Guerrero said two victims were "pulverized" by bullets, rendering them recognizable only by their clothes.
A pediatrician who treated victims of the Uvalde shooting said two children were so damaged by bullets that they could only be identified by their "blood-spattered cartoon clothes."
A gunman opened fire at Robb Elementary School in Uvalde, Texas, on May 24, killing 19 children and two teachers.
Giving testimony to House lawmakers Wednesday ahead of a hearing on gun violence, Dr. Roy Guerrero, a pediatrician who was working at Uvalde Memorial Hospital on the day of the shooting, described the scene as the victims were rushed into his hospital.
"I had heard from some of the nurses that there were two dead children who had been moved to the surgical area of the hospital. What I did find was something no prayer will ever relieve," he said.
"Two children, whose bodies had been so pulverized by the bullets fired at them, decapitated, whose flesh had been so ripped apart, that the only clue as to their identities was the blood-spattered cartoon clothes still clinging to them. Clinging for life and finding none."
"I could only hope these two bodies were a tragic exception to the list of survivors. But as I waited there with my fellow Uvalde doctors, nurses, first responders and hospital staff for other casualties we hoped to save, they never arrived," he added.
According to reports at the time, the gunman fired more than 100 rounds while in the school using an AR-15 style rifle that he had bought days prior to the shooting.
After the shooting, parents of Robb Elementary students awaiting news were asked to hand over DNA samples so that the victims could be matched 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, saying they were the only thing that authorities were able to use to identify 10-year-old victim Maite Rodriguez.
"These are the same green Converse on her feet that turned out to be the only clear evidence that could identify her after the shooting," McConaughey said.
House lawmakers are currently discussing the need for gun control in the wake of Uvalde ahead of a vote on a bill proposing a slew of new restrictions.
As of Wednesday, there had been 33 more mass shootings in US since Uvalde.
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