Two babies, a toddler and a woman were found dead near the U.S.-Mexican border, overcome by the sweltering heat in a glimpse of what could lie ahead this summer as record numbers of migrant families try to get into the United States. Authorities believe the four may have been dead for days before the bodies were discovered on Sunday in the Rio Grande Valley. It was the latest grim discovery of migrants who died while trying to cross the perilous desert and the swollen Rio Grande.
