Authorities in Mexico discovered 652 Central American migrants in six trailers near their border with the United States. The trucks had stopped at a military checkpoint on a highway between Ciudad Victoria and Monterrey in the northern state of Tamaulipas. The state public safety agency said Friday that four suspects were arrested. Reports said that there were 564 Guatemalans, as well as migrants from Honduras, El Salvador, Nicaragua and Belize. Half of those found in the trucks were children, nearly 200 of those children were not accompanied by an adult. The trailers were padlocked, which forced authorities to move them to state police facilities to cut them open. The Red Cross reported that 40 migrants were evaluated for dehydration and malnutrition.