AP/ MIAMI HERALD/ A crumbling alliance between two drug gangs is plunging a 200-mile stretch of Mexico's Eastern border with the U.S. into new violence. From Matamoros to Nuevo Laredo at least 49 people have been killed in less than six weeks. It started in January when an alliance between the Gulf Cartel and the Zetas was broken after a Zetas was murdered in Reynosa.
