Gulf Cartel
Originally, the Gulf Cartel was running smoothly, but the infighting between the two factions in the Gulf Cartel triggered when Samuel Flores Borrego was killed on 2 September 2011. When the Rojos turned on the Metros, the largest faction in the Gulf Cartel, firefights broke throughout Tamaulipas and drug loads were stolen among each other, but the Metros managed to retain control of the major cities that stretched from Matamoros to Miguel Alemán, Tamaulipas.