Video released on Wednesday by federal authorities shows two Ecuadoran infant children being abandoned by smugglers after they were dropped over a 14-foot-high barrier along the US-Mexico border.
A three-year-old girl and her five-year-old sister were unhurt but officials with the US Border Patrol called the incident appalling.
It comes as the Biden administration struggles with finding space to house the several hundred children and teenagers who are crossing the border daily.
Chief Patrol Agent Gloria Chavez, from the El Paso sector which includes parts of Texas and New Mexico, said an agent using a remote camera was able to spot a person straddling the barrier.
“We are currently working with our law enforcement partners in Mexico and attempting to identify these ruthless human smugglers so as to hold them accountable to the fullest extent of the law,” Ms Chavez said in a statement.
The girls were alert but were taken to a hospital to be checked out and cleared. They currently remain at a Border Patrol temporary holding facility pending placement by the US Health and Human Services Department.