Border Patrol agents found four bodies, including three children, near the Rio Grande in South Texas on Sunday, Hidalgo County Sheriff Eddie Guerra said.
Two of the children were infants and one was a toddler, Guerra said. The adult was a 20-year-old woman, he said.
The deaths come amid a huge influx of undocumented immigrants at the Southwest border and demonstrate how treacherous it is to journey, often on foot, to the U.S. from Mexico and Central America.
The bodies were found southeast of Anzalduas Park in the Las Paloma Wildlife Management Area, just north of Reynosa, Mexico, and south of McAllen, Texas, Guerra said.
A U.S. official close to the investigation said Monday that there were no early indications of foul play and they may have died from heat exposure and dehydration.
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SOURCE: NBC News, Tim Stelloh