According to Mexican authorities, the Zetas have become the biggest drug trafficking organization in Mexico. On Feb. 19 Zeta members allegedly instigated a prison riot, killing members of the opposing Gulf Cartel, and covering up their escape. Here are four questions about the Zetas, answered.
Mexico drug war: The US State Department had been offering a reward of $5 million for the capture of Mario Armando Ramirez Trevino, a Gulf Cartel leader.
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