WASHINGTON (CNN) -- U.S. authorities have ratcheted up pressure on one of Mexico's most notorious drug cartels, releasing new details about the so-called Gulf Cartel's operations and offering up to a $50 million reward for the arrest of its leaders. These are weapons that the Mexican army said it seized from the ruthless Gulf Cartel in 2008. A federal indictment unsealed Monday charged Miguel Trevino Morales, a leader of the northern Mexico-based Gulf Cartel, of operating a criminal enterprise, cocaine distribution and firearms violations. Concurrently, prosecutors updated a separate indictment against three other top leaders of the Gulf Cartel: Antonio Cardenas Guillen, Jorge Eduardo Costilla and Heriberto Lazcano, for drug trafficking related crimes, all believed to be at large in Mexico.U.S. authorities ratchet up the pressure on Mexico's notorious Gulf CartelFederal indictment names leader, three other top players in drug cartelPlan to disrupt cartel: "Prosecute their leaders and seize their funding"Enforcement arm of cartel is known as Los Zetas; cartel operates in U.S. cities
The court documents detail telephone conversations between the four leaders and more than a dozen other cartel members allegedly discussing the transportation and smuggling of cocaine and marijuana into the _.