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In this Sept. 5, 2014 photo, weapons allegedly seized from gangs by the military are displayed at a military base in Ciudad Mier, Tamaulipas state, Mexico.
Two rival gangs, the Zetas and the Gulf cartel, which use Tamaulipas as a route to ferry drugs and migrants to the United States have diversified their business, selling stolen gas and crude to refineries in Texas or to gas stations on either side of the border.
(AP Photo/Eduardo Verdugo).