This handout X-ray photo provided by the Chiapas State Attorney General Office in Mexico shows, according to the attorney's office, migrants from Latin America and Asia inside a truck heading to the U.S. at a checkpoint near Tuxtla Gutierrez. (Associated Press)

This handout X-ray photo provided by the Chiapas State Attorney General Office in Mexico shows, according to the attorney's office, migrants from Latin America and Asia inside a truck heading to the U.S. at a checkpoint near Tuxtla Gutierrez. (Associated Press)