A navy officer guards a street where a funeral home is holding the bodies of 72 men and women that were purportedly killed by the Zetas drug gang are in San Fernando, just 100 miles from the the Mexican border with the U.S. near the city of Matamoros, Mexico, Thursday Aug. 26, 2010. A wounded migrant who escaped the Zetas gang stumbled into a military checkpoint and led marines to the scene were migrants from Brazil, Ecuador, El Salvador and Honduras were executed. (AP Photo/Guillermo Arias)

Photo by: Guillermo Arias

A navy officer guards a street where a funeral home is holding the bodies of 72 men and women that were purportedly killed by the Zetas drug gang are in San Fernando, just 100 miles from the the Mexican border with the U.S. near the city of Matamoros, Mexico, Thursday Aug. 26, 2010. A wounded migrant who escaped the Zetas gang stumbled into a military checkpoint and led marines to the scene were migrants from Brazil, Ecuador, El Salvador and Honduras were executed. (AP Photo/Guillermo Arias)