Bodies of woman, infants, toddler found near Rio Grande River in Texas

The individuals may have succumbed to dehydration, authorities said.

The deceased appeared to be two infants, a toddler and a 20-year-old woman, Hidalgo County Sheriff Eddie Guerra told ABC News Rio Grande Valley, Texas, affiliate KRGV.

Because the bodies were found on federal property, the FBI will handle the investigation.

The four people may have died from dehydration, investigators told KRGV.