Article Photos: Central Americans flood north through Mexico to US 20/20

  Edwin Omar Fuentes, a migrant from Honduras, stands by the train tracks as he recovers from an injury he got the night before in an altercation over a piece of clothing, in Coatzacoalcos, Mexico, Wednesday, July 11, 2012. Local officials estimate one thousand immigrants are stranded in this town after a rail bridge collapsed blocking the passage of cargo trains used by the travelers heading to the United States. While the number of Mexicans heading to the U.S. has dropped dramatically, a surge of Central American migrants is making the 1,000-mile northbound journey this year, fueled in large part by the rising violence brought by the spread of Mexican drug cartels. (AP Photo/Miguel Juarez)