The 2012 Nuevo Laredo massacres were a series of mass murder attacks between the allied Sinaloa Cartel and Gulf Cartel against Los Zetas in the border city of Nuevo Laredo, Tamaulipas, across the U.S.-Mexico border from Laredo, Texas. The drug-violence in Nuevo Laredo began back in 2003, when the city was controlled by the Gulf Cartel. Most media reports that write about the Mexican Drug War, however, point to 2006 as the start of the drug war. That year is a convenient historical marker because that's when Felipe Calderón took office and carried out an aggressive approach against the cartels. But authors like Ioan Grillo and Sylvia Longmire note that Mexico's drug war actually began at the end of Vicente Fox's administration in 2004, when the first major battle took place in Nuevo Laredo